[Howto] project lines from volume to sketch in FreeCAD

FreeCAD version 0.16

1. create a new sketch
2. close the newly created sketch
3. select a face in the modell
4. click in the toolbar the button “assign sketch to face”
5. choose the newly created sketch from the displayed drop-down-list
6. click ok, done

now you can edit the newly created sketch and project the volume lines/edges with the button “create edge linked with external geometry”