At times I find it would be nice to be able to do a "cut" from a sketch on two parts in an assembly.
Here I have a 7 gage welded up box, the transparent part is a 14 gage cover. It would be nice in the assembly to just sketch a circle on the 14 gage cover and do a cut through both of these parts for my screw. I can see that this can be done in the assembly level, but the cut feature does not show in the part level. Normally the way I would do this is to put a hole in one part, do the cut, then go edit the other part, do a sketch (maybe even convert entities) and then do a cut on that part.
in the property manager of the assembly cut, near the bottom, is a section on feature scope. in there there is a check box to propogate the feature to the part file(s). of course this adds an external reference to the part(s), but you would have taht with teh convert entities as well.