You could attach photos, images, files, etc.
I'm not sure what is propriatary and what isn't. I will see if i can draw up some generic stuff that would illustrate what im on about.
I don't use this SE feature, but I do know there is a way to save and re-use features.
The thing that does not exist and wish it did, is the ability to move hole along with the items that needs to use them. IE holes would just show up when a bolted part is put into place.
Make sure you look at Systems Libraries and Quick Sheet Templates.