I have heard many different opinions on this subject and wanted to ask if any of you have had the same experience or what you do in your systems. I was told by some very experienced PTC employees that it was NOT GOOD to either rename or delete instances from the system. I have many many instances of fastners that need to be removed but I am not sure the best way to do this. Of course this is overcomplicated due to being on WIndchill. I would like to know your thoughts if you have a few minutes.