Use Collections to organize your library.
Add sub-collections by right-clicking under the main collection.
Groups in Mendeley allow users to share information with others. Groups are private, invitation only spaces for collaborative work. You can share references & PDFs with up to 25 people.
Create a group
Click New Group link in Mendeley to create a new private group (left) or go directly to your account at Mendeley.com (right). Note that you will have to go to your Mendeley account to complete the process.
Add members to the group by clicking on the Invite Members icon. For invitations, make sure to use the email that new members used to create their accounts. You can begin to add documents to the group either from your own account or from the group account. Note: references in groups are not in your All References library, they are separate.