I still don't fully understand..
Are you maybe asking about how to create a workplane offset from this bottom face to create your sketch on?
Can you show an image of why simply sketching on the bottom plane isn't working or causes problems?
Or maybe you just want to create a new part with just this sketch and create an assembly and then you can enable/disable that part if you want?
I use the cam functionality all the time and I don't see how any sketch gets in the way but you can always just right click on a sketch and select "suppress" or check "visibility" to turn that sketch off.
Any fixtures/vice/hold downs I model as their own parts and create an assembly and then do the cam programming to that assembly.
https://www.youtube.com/watch?v=IfnMWMB4Uls
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Inventor 2023 - Dell Precision 5570
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