I have noticed that when I create a new sub assembly  and go into edit design data and look at the sub assembly list that there will be a lot, as if it displays every attempt to save the sub assembly.  All these extras do not appear in the project when viewed in Database Explorer, and they don't seem to cause any issue except make more things to scroll through, (that window is way too small, fix it.)  How do these get her and how do I get rid of them.