I have many links within a Document References panel. By definition, that is tied to one specific document. I now realize that it would be more useful had I set it up as Project References.
Is there a way to “upgrade” a group of Document References links to Project References status?
There is unfortunately no way of doing that. The best solution I can think of, if there are too many to really consider reproducing them by hand, is to duplicate the document with the references list and move the duplicate up to the top of the Binder, calling it “References” or whatever works for you. This way it remains obvious and easily accessible, albeit not quite as nice as having them globally available in the Inspector via Project References.