Please consider adding the ability to copy a Group Set with all or some of the Custom Groups from one EndNote Library to another EndNote Library. Currently you have to manually recreate the Group Set and Custom Group labels in the second library. Then open each Custom Group, highlight the citations, copy them from the first library. Last step paste the citations into the second library and make sure the citations are in the correct Custom Group. If there are any files attached, they have to be moved as well.