EndNote Online allows you to organise your references into groups. By default EndNote Online places references into the Unfiled group.
To create a new group:
You can place a reference in multiple groups. To see which group(s) a given reference is currently in, click on the folder icon below the reference.
EndNote Online allows you to share your reference groups with other EndNote Online users.
Please note that attachments (e.g. PDFs) are not included when sharing.