I created a separate bibliography for each section in a single Microsoft Word but my supervioser said that I have to put (merge) them all togather. Can anyone tell me how I should do that?
First make a copy. If there are no section breaks between the sections, information (to the temporary citation state with curly brackets), make sure there are no residual bibliographies present in the document and reformating (format bibliography) should produce one list at the end.
If you have section breaks you just need to make sure the output style you are using is not set to produce a bibliography at the end of each section. What Endnote output style are you using?