From FreeCAD Documentation
Notes
- The tool will work best with 2D objects from the Draft Workbench or Sketcher Workbench.
- The selected object can also be an Arch SectionPlane, which will show the elements viewed by that plane.
- If there is no existing page, a new one will be created.
- If no page was selected but there is at least one in the document, the first page found will be used to put the projections.
- If you select a sheet and the objects already projected on that sheet, the projections will be updated.