Delete all revision symbols except latest

Hi all,

I'm looking to find a way to be able to delete revision symbols that don't belong to the latest revision.  If I simply delete one and don't show the dialog boxes after answering no to delete the corresponding row and yes to delete the corresponding symbols it works fairly well.  The exception is when creating the symbols for the new revision and want to delete one.  then all will get deleted.  Also not sure if the Zone tags will get deleted as we don't have that functionality on our sheets yet. I would want to keep that info on the table.