How to sort EndNote library according to the order of in-text citations


I am using EndNote X9 and I would like to sort my reference library according to the order by which the references appear in my MS Word document. When I right-clicked on the header of the reference list, I do not see an option for “Citation number” in the dropdown menu.  “Record Number” does not correspond to the citation number. It would be useful to sort references according to citation order, especially when one is copying references across different libraries. Is there a way of doing this?