You can create groups (folders) to store citations on a particular topic or project in three steps:

1. Click on "Organize" then "Manage my groups."
2. Scroll down and click on "New Group."
3. A popup will allow you to name a new group, which will go into your groups list.

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If you already have citations in a group or in the unfiled group, you can create a new group and copy citations into it:
 

1. Click on "My References."
2. Find your source group and click on it.
3. Select the citations you want to move to a new group.
4. Click on the "Add to a group" and find "New Group" near the bottom of the list.
5. Name your new group.
6. Click OK. The selected citations will be copied to your new group and will also remain in the source group.