To unassociate one page from a document:
Click The Inbox tab & History.
On the Files History page, find your document.
The Files History page holds every document you've brought into Bill.com and processed.
Click the file to open it.
Go to the page you want to unassociate
In the small window titled "Process item by:" click Unassociate
The unassociated page goes back to youInbox where you can re-assign or delete it.