You can move unneeded Supporting Documents from your Active Docs bucket to the Reject bucket
Drag unwanted Documents to your Reject Box
Grab the Thumbnail of the document you want to get out of your Active Docs, and drag to the Reject box:
You will be prompted to add a reason:
The Document will then be removed from Active.
To view Rejected Documents
To view your rejected documents, click the Rejected Control. You will be taken to the Rejected Box, and you will see your rejected document/s.
If you hover on the document, you will be able to see the reject reason that you have added:
Move a rejected document back to Active
If you would like to move a rejected documnent back to Active, click on the document (or documents), and a new control "Move to Active" will be enabled: