1. Go to Accounting > Billing > Billing Cycle
2. Click on 'View' for the Billing Cycle containing the LHIN invoice you need
3. Once you're viewing the Billing Cycle, navigate to the 'Invoices' tab
4. From the dropdown menu on the 'View' button, select 'Set Filename'
5. Enter the desired filename prefix of your invoice and click 'Ok.' The invoice name will update with the prefix you added.
6. To edit a file name prefix, just click on 'Set Filename' again, make your changes, and click 'Ok'