To unassociate one page from a document:

• Click Inbox
• Click History
• Click on your document
  • The Files History page holds every document you've brought into Bill.com and processed.
• Go to the page you want to unassociate
• In the small window titled "Process item by:" click Unassociate
• The unassociated page goes back to your Inbox where you can re-assign or delete it.