Click on "Administration".
Click on the "Receivables" tile.
Enter an Account Number or Customer Name, then press enter or click the magnifying glass icon to search.
Locate the appropriate Charge Account within the search results, then click "View".
Click on the "All Outstanding" section.
Click the Actions Menu (...).
Select "Write Off".
Add a Comment related to the Write Off (as needed).
Click "Ok" to save.
To verify the Write Off was completed:
Click on the "All Payments" section.
See the "Write Off" entry with the amount noted.