From FreeCAD Documentation
- Select the face of the SheetMetal object to be embossed.
- Hold down the Ctrl key (or the Command key on macOS).
- Add the bottom face (back side) of the solid defining the shape to the selection.
- Add a side face adjoined the bottom face to indicate the position of the first cut to the selection.
- Add the opposite side face adjoined the bottom face to indicate the position of the second cut to the selection.
- Release the Ctrl key (or the Command key).
- Activate the SheetMetal Forming command (see above).