It would be easy if you provided a file. This way we know exactly what you are dealing with and most of the guess work is eliminated.

If I understand correctly you want PartDesign Thickness or Part Thickness. You could also try Part_CompOffsetTools to create offset solid and difference it or create offset sketch and pocket it.

Probably intended to display a list of body features to select the tip from? And never actually implemented...

How could I get it? I dont understand... What you want to "get"? If that setting is unchecked the STEP file is imported AS IS. If it is checked all shells under a single COMPOUND in the STEP are merged into a single object when importing the file. So if you want to be able to separate individual sh...

Hope that is near what you have in mind. Used Sketcher_CarbonCopy to link geometry of hole sketches to base sketch. Pockets direction is reversed so the pockets go up. I changed a little constraints in your first sketch. If somewhere there will be a tangency between elements (here lines and arc) bet...

Maybe this will help: https://forum.freecadweb.org/viewtopic.php?f=3&t=44614?
From here: https://forum.freecadweb.org/viewtopic. ... 20#p382929

Can you show what error do you get this time? No problems here with latest from Github. Also it used Python 3.6.8 and not 3.8.2. where do you get that 3.8.2 from? OS: Windows 8.1 (6.3) Word size of OS: 64-bit Word size of FreeCAD: 64-bit Version: 0.19.20311 (Git) Build type: Release Branch: master H...

Have you tried On/Off? It works as expected with that edge also:

Ok, my bad. Maybe this is related https://forum.freecadweb.org/viewtopic.php?f=4&t=44875
You could try FreeCAD_0.19.20311_x64_LP_12.1.2_PY3QT5-WinVS2015.7z - works Ok here.