diff --git a/src/App.tsx b/src/App.tsx
index baf4b78..5a78c38 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -115,7 +115,7 @@ import { useGripEditing } from "./state/useGripEditing";
 import { usePanelHostBase } from "./state/usePanelHostBase";
 import { useDockDragState } from "./state/useDockDragState";
 import { useMouseSelectionHandlers } from "./state/useMouseSelectionHandlers";
-import { containingGroupId, EMPTY_MEMBERSHIP } from "./state/groupActions";
+import { addNewElementsToActiveGroup, containingGroupId, EMPTY_MEMBERSHIP } from "./state/groupActions";
 import type { GroupMembership } from "./state/groupActions";
 import { useProjectFileActions } from "./state/useProjectFileActions";
 import { useProjectActions } from "./state/useProjectActions";
@@ -621,6 +621,7 @@ export default function App() {
   const transformSel: TransformSelection = {
     wallIds: selectedWallIds,
     drawingId: selectedDrawingId,
+    drawingIds: selectedDrawingIds,
     extrudedSolidId: selectedExtrudedSolidId,
     columnId: selectedColumnId,
   };
@@ -745,6 +746,7 @@ export default function App() {
     selectedDrawingIds,
     selectedExtrudedSolidId,
     selectedColumnId,
+    groupPath,
     setProject,
     setDraft,
   });
@@ -761,6 +763,7 @@ export default function App() {
     selectedDrawingIds,
     selectedExtrudedSolidId,
     selectedColumnId,
+    groupPath,
     setProject,
     setDraft,
   };
@@ -808,7 +811,15 @@ export default function App() {
       },
       pxPerMeter: () => planViewRef.current?.pxPerMeter() ?? 90,
       setDraft: (d) => cmdLatest.current.setDraft(d),
-      commit: (mutate) => cmdLatest.current.setProject(mutate),
+      // Zeichnet man WÄHREND man eine Gruppe betreten hat (Isolation), wird
+      // das neue Element automatisch Mitglied dieser Gruppe (Nutzer-Wunsch:
+      // „wenn man etwas neu zeichnet ... zeichnet man in der Gruppe") — s.
+      // state/groupActions.ts::addNewElementsToActiveGroup (Diff vor/nach
+      // Commit über alle Elementarten, additiv zur eigentlichen Mutation).
+      commit: (mutate) =>
+        cmdLatest.current.setProject((p) =>
+          addNewElementsToActiveGroup(p, mutate(p), cmdLatest.current.groupPath),
+        ),
       isFloor: () => cmdLatest.current.activeLevel.kind === "floor",
       // Frisch über `text`/`textbox` erzeugtes Element sofort inline editieren
       // (kein Lookup nötig — der Commit hat es bereits angehängt, s. engine.ts
@@ -1270,6 +1281,7 @@ export default function App() {
     setActiveTransform,
     selectedWallIds,
     selectedDrawingId,
+    selectedDrawingIds,
     selectedExtrudedSolidId,
     selectedColumnId,
     engine,
diff --git a/src/commands/cmds/array.ts b/src/commands/cmds/array.ts
index b53b951..c3a8aa9 100644
--- a/src/commands/cmds/array.ts
+++ b/src/commands/cmds/array.ts
@@ -49,12 +49,19 @@ function targetFromFields(base: Vec2, locks: Record<string, number>, cursor: Vec
 }
 
 function hasSelection(sel: CommandSelection): boolean {
-  return sel.wallIds.length > 0 || sel.drawingId !== null || !!sel.extrudedSolidId || !!sel.columnId;
+  return (
+    sel.wallIds.length > 0 ||
+    sel.drawingId !== null ||
+    (sel.drawingIds?.length ?? 0) > 0 ||
+    !!sel.extrudedSolidId ||
+    !!sel.columnId
+  );
 }
 function toTransformSel(sel: CommandSelection): TransformSelection {
   return {
     wallIds: sel.wallIds,
     drawingId: sel.drawingId,
+    drawingIds: sel.drawingIds,
     extrudedSolidId: sel.extrudedSolidId,
     columnId: sel.columnId,
   };
diff --git a/src/commands/cmds/copy.ts b/src/commands/cmds/copy.ts
index 021004c..2545534 100644
--- a/src/commands/cmds/copy.ts
+++ b/src/commands/cmds/copy.ts
@@ -45,6 +45,7 @@ function hasSelection(sel: CommandSelection): boolean {
   return (
     sel.wallIds.length > 0 ||
     sel.drawingId !== null ||
+    (sel.drawingIds?.length ?? 0) > 0 ||
     !!sel.extrudedSolidId ||
     !!sel.columnId
   );
@@ -53,6 +54,7 @@ function toTransformSel(sel: CommandSelection): TransformSelection {
   return {
     wallIds: sel.wallIds,
     drawingId: sel.drawingId,
+    drawingIds: sel.drawingIds,
     extrudedSolidId: sel.extrudedSolidId,
     columnId: sel.columnId,
   };
diff --git a/src/commands/cmds/mirror.ts b/src/commands/cmds/mirror.ts
index 31af7ba..ba79f84 100644
--- a/src/commands/cmds/mirror.ts
+++ b/src/commands/cmds/mirror.ts
@@ -35,6 +35,7 @@ function hasSelection(sel: CommandSelection): boolean {
   return (
     sel.wallIds.length > 0 ||
     sel.drawingId !== null ||
+    (sel.drawingIds?.length ?? 0) > 0 ||
     !!sel.extrudedSolidId ||
     !!sel.columnId
   );
@@ -45,6 +46,7 @@ function toTransformSel(sel: CommandSelection): TransformSelection {
   return {
     wallIds: sel.wallIds,
     drawingId: sel.drawingId,
+    drawingIds: sel.drawingIds,
     extrudedSolidId: sel.extrudedSolidId,
     columnId: sel.columnId,
   };
diff --git a/src/commands/cmds/move.ts b/src/commands/cmds/move.ts
index f955af8..f4214e9 100644
--- a/src/commands/cmds/move.ts
+++ b/src/commands/cmds/move.ts
@@ -52,6 +52,7 @@ function hasSelection(sel: CommandSelection): boolean {
   return (
     sel.wallIds.length > 0 ||
     sel.drawingId !== null ||
+    (sel.drawingIds?.length ?? 0) > 0 ||
     !!sel.extrudedSolidId ||
     !!sel.columnId
   );
@@ -62,6 +63,7 @@ function toTransformSel(sel: CommandSelection): TransformSelection {
   return {
     wallIds: sel.wallIds,
     drawingId: sel.drawingId,
+    drawingIds: sel.drawingIds,
     extrudedSolidId: sel.extrudedSolidId,
     columnId: sel.columnId,
   };
diff --git a/src/state/groupActions.test.ts b/src/state/groupActions.test.ts
index bc7ddd6..ad2e549 100644
--- a/src/state/groupActions.test.ts
+++ b/src/state/groupActions.test.ts
@@ -7,6 +7,7 @@
 
 import { describe, it, expect } from "vitest";
 import {
+  addNewElementsToActiveGroup,
   applyGroupDimming,
   containingGroupId,
   expandToGroups,
@@ -185,6 +186,51 @@ describe("applyGroupDimming", () => {
   });
 });
 
+describe("addNewElementsToActiveGroup", () => {
+  const g1: Group = { id: "g1", wallIds: ["w1"], drawingIds: [], ceilingIds: [], roomIds: [], stairIds: [], columnIds: [], roofIds: [], openingIds: [], groupIds: [] };
+  const line = (id: string) =>
+    ({ id, type: "drawing2d", levelId: "eg", categoryCode: "20", geom: { shape: "line", a: { x: 0, y: 0 }, b: { x: 1, y: 0 } } }) as Project["drawings2d"][number];
+
+  it("neu gezeichnetes Element wird Mitglied der aktiven (innersten) Gruppe", () => {
+    const before = project([g1]);
+    const after: Project = { ...before, drawings2d: [line("d1")] };
+    const result = addNewElementsToActiveGroup(before, after, ["g1"]);
+    const g = result.groups!.find((x) => x.id === "g1")!;
+    expect(g.drawingIds).toEqual(["d1"]);
+    expect(g.wallIds).toEqual(["w1"]); // bestehende Mitgliedschaft bleibt
+  });
+
+  it("ohne aktive Gruppe (groupPath leer) bleibt das Projekt unverändert", () => {
+    const before = project([g1]);
+    const after: Project = { ...before, drawings2d: [line("d1")] };
+    const result = addNewElementsToActiveGroup(before, after, []);
+    expect(result).toBe(after); // unverändert (Referenzgleichheit)
+  });
+
+  it("keine Änderung (before === after) ist ein No-op", () => {
+    const p = project([g1]);
+    expect(addNewElementsToActiveGroup(p, p, ["g1"])).toBe(p);
+  });
+
+  it("mehrere neue Elemente auf einmal (z. B. Feld/Array) werden alle Mitglied", () => {
+    const before = project([g1]);
+    const after: Project = { ...before, drawings2d: [line("d1"), line("d2"), line("d3")] };
+    const result = addNewElementsToActiveGroup(before, after, ["g1"]);
+    const g = result.groups!.find((x) => x.id === "g1")!;
+    expect(g.drawingIds.sort()).toEqual(["d1", "d2", "d3"]);
+  });
+
+  it("verschachtelt: neues Element landet in der INNERSTEN (aktiven) Gruppe, nicht der äusseren", () => {
+    const inner: Group = { id: "g1", wallIds: [], drawingIds: [], ceilingIds: [], roomIds: [], stairIds: [], columnIds: [], roofIds: [], openingIds: [], groupIds: [] };
+    const outer: Group = { id: "g2", wallIds: [], drawingIds: [], ceilingIds: [], roomIds: [], stairIds: [], columnIds: [], roofIds: [], openingIds: [], groupIds: ["g1"] };
+    const before = project([inner, outer]);
+    const after: Project = { ...before, drawings2d: [line("d1")] };
+    const result = addNewElementsToActiveGroup(before, after, ["g2", "g1"]);
+    expect(result.groups!.find((x) => x.id === "g1")!.drawingIds).toEqual(["d1"]);
+    expect(result.groups!.find((x) => x.id === "g2")!.drawingIds).toEqual([]);
+  });
+});
+
 describe("ungroup", () => {
   it("löst genau EIN Level auf; Untergruppen bleiben als eigene Gruppen bestehen", () => {
     const inner: Group = { id: "g1", wallIds: ["w1"], drawingIds: [], ceilingIds: [], roomIds: [], stairIds: [], columnIds: [], roofIds: [], openingIds: [], groupIds: [] };
diff --git a/src/state/groupActions.ts b/src/state/groupActions.ts
index 3d0b305..e59aaeb 100644
--- a/src/state/groupActions.ts
+++ b/src/state/groupActions.ts
@@ -227,6 +227,47 @@ export function applyGroupDimming(
   });
 }
 
+/** IDs, die in `after` neu hinzugekommen sind (in `before` noch nicht vorhanden). */
+function newIds(before: { id: string }[], after: { id: string }[]): string[] {
+  const beforeIds = new Set(before.map((x) => x.id));
+  return after.filter((x) => !beforeIds.has(x.id)).map((x) => x.id);
+}
+
+/**
+ * Zeichnet man WÄHREND man eine Gruppe betreten hat (Isolation) ein neues
+ * Element, wird es automatisch Mitglied dieser (innersten) Gruppe — man
+ * zeichnet ja SICHTLICH „in" ihr (Nutzer-Wunsch, Vectorworks-Verhalten).
+ * Vergleicht `before`/`after` je Elementart auf neu hinzugekommene IDs (Diff
+ * über die commit-Mutation) und hängt sie an die aktive Gruppe an. `before`
+ * === `after` (keine Änderung) oder `groupPath` leer → `after` unverändert.
+ */
+export function addNewElementsToActiveGroup(
+  before: Project,
+  after: Project,
+  groupPath: string[],
+): Project {
+  if (groupPath.length === 0 || before === after) return after;
+  const activeId = groupPath[groupPath.length - 1];
+  const g = (after.groups ?? []).find((x) => x.id === activeId);
+  if (!g) return after;
+  const added: GroupMembership = {
+    wallIds: newIds(before.walls, after.walls),
+    drawingIds: newIds(before.drawings2d, after.drawings2d),
+    ceilingIds: newIds(before.ceilings ?? [], after.ceilings ?? []),
+    roomIds: newIds(before.rooms ?? [], after.rooms ?? []),
+    stairIds: newIds(before.stairs ?? [], after.stairs ?? []),
+    columnIds: newIds(before.columns ?? [], after.columns ?? []),
+    roofIds: newIds(before.roofs ?? [], after.roofs ?? []),
+    openingIds: newIds(before.openings ?? [], after.openings ?? []),
+  };
+  if (KEYS.every((k) => added[k].length === 0)) return after;
+  const merged: Group = { ...g, ...mergeMembership(g, added) };
+  return {
+    ...after,
+    groups: (after.groups ?? []).map((x) => (x.id === activeId ? merged : x)),
+  };
+}
+
 /**
  * Erzeugt eine neue Gruppe aus einer Mengen-Auswahl (+ optional bereits
  * gewählte Gruppen, die dabei als Untergruppen verschachtelt werden — „zwei
diff --git a/src/state/useKeyboardShortcuts.ts b/src/state/useKeyboardShortcuts.ts
index 8294de8..a94421c 100644
--- a/src/state/useKeyboardShortcuts.ts
+++ b/src/state/useKeyboardShortcuts.ts
@@ -502,6 +502,7 @@ export function useTransformShortcuts(
   ) => void,
   selectedWallIds: string[],
   selectedDrawingId: string | null,
+  selectedDrawingIds: string[],
   selectedExtrudedSolidId: string | null,
   selectedColumnId: string | null,
   engine: CommandEngine,
@@ -543,6 +544,7 @@ export function useTransformShortcuts(
       const hasSel =
         selectedWallIds.length > 0 ||
         !!selectedDrawingId ||
+        selectedDrawingIds.length > 0 ||
         !!selectedExtrudedSolidId ||
         !!selectedColumnId;
       if (!hasSel) return;
@@ -567,6 +569,7 @@ export function useTransformShortcuts(
     activeTransform,
     selectedWallIds,
     selectedDrawingId,
+    selectedDrawingIds,
     selectedExtrudedSolidId,
     selectedColumnId,
     engine,
diff --git a/src/tools/transform.test.ts b/src/tools/transform.test.ts
new file mode 100644
index 0000000..a8e51a3
--- /dev/null
+++ b/src/tools/transform.test.ts
@@ -0,0 +1,82 @@
+/**
+ * `commitTransform`/`transformPreview` mit MEHREREN gewählten 2D-Elementen
+ * (`TransformSelection.drawingIds`) — Nutzer-Report: "wenn ich zwei Linien
+ * anwähle, dass ich dann m usw nicht verwenden kann". Vorher trug
+ * `TransformSelection` nur ein einzelnes `drawingId`, das bei einer
+ * Mehrfachauswahl (2+ Elemente) `null` war → Bewegen/Kopieren/Spiegeln/
+ * Drehen/Feld griffen gar nicht.
+ */
+
+import { describe, it, expect } from "vitest";
+import { commitTransform } from "./transform";
+import type { TransformSelection } from "./transform";
+import type { Drawing2D, Project } from "../model/types";
+
+function project(drawings: Drawing2D[]): Project {
+  return {
+    id: "t",
+    name: "T",
+    lineStyles: [],
+    hatches: [],
+    components: [],
+    wallTypes: [],
+    drawingLevels: [],
+    layers: [],
+    walls: [],
+    doors: [],
+    drawings2d: drawings,
+  };
+}
+
+function line(id: string, x: number): Drawing2D {
+  return {
+    id,
+    type: "drawing2d",
+    levelId: "eg",
+    categoryCode: "20",
+    geom: { shape: "line", a: { x, y: 0 }, b: { x: x + 1, y: 0 } },
+  };
+}
+
+describe("commitTransform — Mehrfachauswahl (drawingIds)", () => {
+  it("move: verschiebt ALLE gewählten 2D-Elemente, nicht nur eines", () => {
+    const p = project([line("d1", 0), line("d2", 5), line("d3", 10)]);
+    const sel: TransformSelection = { wallIds: [], drawingId: null, drawingIds: ["d1", "d2"] };
+    const next = commitTransform(p, sel, "move", [{ x: 0, y: 0 }, { x: 2, y: 3 }], "move", 1);
+    const d1 = next.drawings2d.find((d) => d.id === "d1")!.geom;
+    const d2 = next.drawings2d.find((d) => d.id === "d2")!.geom;
+    const d3 = next.drawings2d.find((d) => d.id === "d3")!.geom;
+    if (d1.shape === "line") expect(d1.a).toEqual({ x: 2, y: 3 });
+    if (d2.shape === "line") expect(d2.a).toEqual({ x: 7, y: 3 }); // 5+2
+    if (d3.shape === "line") expect(d3.a).toEqual({ x: 10, y: 0 }); // nicht gewählt, unverändert
+  });
+
+  it("copy: dupliziert ALLE gewählten 2D-Elemente (Original bleibt)", () => {
+    const p = project([line("d1", 0), line("d2", 5)]);
+    const sel: TransformSelection = { wallIds: [], drawingId: null, drawingIds: ["d1", "d2"] };
+    const next = commitTransform(p, sel, "move", [{ x: 0, y: 0 }, { x: 1, y: 0 }], "copy", 1);
+    expect(next.drawings2d.length).toBe(4); // 2 Original + 2 Kopien
+  });
+
+  it("array: dupliziert ALLE gewählten 2D-Elemente N-mal", () => {
+    const p = project([line("d1", 0), line("d2", 5)]);
+    const sel: TransformSelection = { wallIds: [], drawingId: null, drawingIds: ["d1", "d2"] };
+    const next = commitTransform(p, sel, "move", [{ x: 0, y: 0 }, { x: 1, y: 0 }], "array", 3);
+    expect(next.drawings2d.length).toBe(8); // 2 Original + 2×3 Kopien
+  });
+
+  it("weiterhin abwärtskompatibel: einzelnes `drawingId` (ohne drawingIds) funktioniert unverändert", () => {
+    const p = project([line("d1", 0)]);
+    const sel: TransformSelection = { wallIds: [], drawingId: "d1" };
+    const next = commitTransform(p, sel, "move", [{ x: 0, y: 0 }, { x: 3, y: 0 }], "move", 1);
+    const d1 = next.drawings2d[0].geom;
+    if (d1.shape === "line") expect(d1.a).toEqual({ x: 3, y: 0 });
+  });
+
+  it("drawingId + drawingIds zusammen werden dedupliziert (kein Doppel-Verschieben)", () => {
+    const p = project([line("d1", 0), line("d2", 5)]);
+    const sel: TransformSelection = { wallIds: [], drawingId: "d1", drawingIds: ["d1", "d2"] };
+    const next = commitTransform(p, sel, "move", [{ x: 0, y: 0 }, { x: 1, y: 0 }], "copy", 1);
+    expect(next.drawings2d.length).toBe(4); // je EINE Kopie pro Element, nicht zwei für d1
+  });
+});
diff --git a/src/tools/transform.ts b/src/tools/transform.ts
index 76cd51b..979b9f4 100644
--- a/src/tools/transform.ts
+++ b/src/tools/transform.ts
@@ -30,13 +30,27 @@ export type CopyMode = "move" | "copy" | "array" | "distribute"; // U / I / O /
 /** Welche Auswahl transformiert wird. */
 export interface TransformSelection {
   wallIds: string[];
+  /**
+   * Einzeln gewähltes 2D-Element (Legacy-Feld, s. `CommandSelection.drawingId`).
+   * `drawingIds` (Mehrfachauswahl) wird bevorzugt ausgewertet; beide zusammen
+   * ergeben die MENGE der zu transformierenden 2D-Elemente (Union, dedupliziert).
+   */
   drawingId: string | null;
+  /** ALLE gewählten 2D-Elemente (Mehrfachauswahl) — s. `CommandSelection.drawingIds`. */
+  drawingIds?: string[];
   /** Gewählter extrudierter Körper (truck-Integration); nur move.ts setzt ihn. */
   extrudedSolidId?: string | null;
   /** Gewählte Stütze (Tragwerk); von move/copy/mirror gesetzt. */
   columnId?: string | null;
 }
 
+/** Vereinigt `drawingId`/`drawingIds` zu einer eindeutigen ID-Menge (dedupliziert). */
+function drawingIdSet(sel: TransformSelection): Set<string> {
+  const ids = new Set(sel.drawingIds ?? []);
+  if (sel.drawingId) ids.add(sel.drawingId);
+  return ids;
+}
+
 /** Wie viele Klickpunkte die Operation braucht (Drehen = 3, sonst 2). */
 export const requiredPoints = (op: TransformOp): number => (op === "rotate" ? 3 : 2);
 
@@ -116,10 +130,8 @@ function gatherItems(project: Project, sel: TransformSelection): AnyItem[] {
   const items: AnyItem[] = [];
   const ids = new Set(sel.wallIds);
   for (const w of project.walls) if (ids.has(w.id)) items.push({ kind: "wall", wall: w });
-  if (sel.drawingId) {
-    const d = project.drawings2d.find((x) => x.id === sel.drawingId);
-    if (d) items.push({ kind: "drawing", drawing: d });
-  }
+  const drawIds = drawingIdSet(sel);
+  for (const d of project.drawings2d) if (drawIds.has(d.id)) items.push({ kind: "drawing", drawing: d });
   if (sel.extrudedSolidId) {
     const s = (project.extrudedSolids ?? []).find((x) => x.id === sel.extrudedSolidId);
     if (s) items.push({ kind: "extrudedSolid", solid: s });
@@ -292,9 +304,10 @@ export function commitTransform(
   if (movesOriginal(mode)) {
     const fn = transformFn(op, pts, 1);
     walls = walls.map((w) => (wallIds.has(w.id) ? { ...w, start: fn(w.start), end: fn(w.end) } : w));
-    if (sel.drawingId) {
+    const moveDrawIds = drawingIdSet(sel);
+    if (moveDrawIds.size > 0) {
       drawings2d = drawings2d.map((d) =>
-        d.id === sel.drawingId ? { ...d, geom: mvGeom(d.geom, fn) } : d,
+        moveDrawIds.has(d.id) ? { ...d, geom: mvGeom(d.geom, fn) } : d,
       );
     }
     if (sel.extrudedSolidId) {