I have a document which has a long list of references to be included at the end of the document (which I have set up as EndNotes). The document will be used as a master template; the user will choose a set of options and based on those choices, the appropriate sections of the document will be either removed or included in the final document

When a section is removed, the corresponding notes are to be removed as well, and this works as I have expected. The unneeded notes are removed, and the existing notes are renumbered to follow their current order.

However, several of the references are used in multiple places, and I have not seen any way to do this other than to create the EndNote at the first instance, then create a cross-reference to the EndNote for later uses. The problem is, if the section that includes the original EndNote is removed, but is still used somewhere else via a cross-reference, then the referenced note is still deleted.

Is there a way to do this so that a note is only deleted when all references to it are removed? Also, it would have to be renumbered if there are other notes between the first occurrance, and the first cross reference.