If you have a Word document that was created using EndNote and still has the EndNote coding (as shown by the grey background when you click citations), then you are able to extract all of the citations from that document and add them to your EndNote library. This is useful if, for example, your professor used EndNote to write an article. You could get a Word copy of the article and extract and save all of their references into your own personal library.
To do this, in Word choose to “export to EndNote” and “export traveling library.”