This is somewhat related to my other post, but it might help new people.
I often select a few objects and do and “invert and hide objects”, yet I find myself yearning to add a few objects to what I see.
So this is what I do:
1.) I select all.
2.) I “Show Objects” (I still have my objects selected)
3.) I select the things additional I want.
4.) I “Invert and Hide Objects” (with everything I had before and I want additionally)