on the endnote ribbon in word, there is a dropdown option to export to endnote. I would export to a new library and import that library into your main library with discard duplicates on, so you only retrieve the new references.
on the endnote ribbon in word, there is a dropdown option to export to endnote. I would export to a new library and import that library into your main library with discard duplicates on, so you only retrieve the new references.