Click on the 3D History of the sketch feature to be copied.

In the context menu select Copy (only sketch).

Copy (only sketch)

-> The outline of the sketch is marked in color.

Mark the plane on which you want to insert the sketch and call the context menu command Paste sketch.

-> The Sketcher is opened.

Confirm the sketch by clicking on Accept changes (or perform changes before).

-> The Sketcher is closed.

-> The sketch is inserted on the plane selected before. In this example you can perform an extrusion now.

Sketch inserted