@tig said:
I can now see the 'angle' is the now-cut-slab viewed obliquely.
So PushPull should work, provided that you have drawn real lines on the face within the component/group so as to divide it into parts before doing the 'push'...
Guides will never split a face.
Lines drawn on the outside of a container [group/component] will never split a face within.
Either redraw the lines within the container, or select the lines that are in the wrong context, Edit>Cut then edit the container and Edit>PasteInPlace - now these newly added lines should split up the face they land on inside the container - it's now ready to PushPull...........
We seem to be making heavy weather of what turns out to be a simple task
Thank you Tig.