Groups can help you organize your references. You can create groups to organize your references by topic, by class, by project, or any other preference you may have.
For both Macs and PCs: In your EndNote library, go to the menu Groups and select 'Create Group'. A new group will be created in the 'My Group's section on the left hand side of the library. Name the group, and then you can drag and drop references into it for organization. For detailed screenshots of both EndNote X9 and EndNote 20 on both a Mac and PC, please click here.