The Groups feature in EndNote enables you to organise your library without resorting to the creation of multiple libraries. References can belong to several different groups or be deleted from a group while always remaining available in All References. Groups can be renamed or deleted. Several Groups can be merged into one new Group. Group Sets can be formed. All of the Groups will appear on the left panel under My Library.
1. Use Custom Groups to manually group references
2. Use Group Sets to organise your numerous groups
3. Use Smart Groups to automatically add references to a group with specific criteria