You can add a new tender type from within the setup Wizard > Invoice Setup > Tender Types. Select a Character that is not assigned. Enter the description and ensure you enable it in the 'enabled' column. You should now see this tender type available in your tender options when receiving payments.
*If you do not have access to the Setup Wizard, please contact your system administrator.
***Never change the intended purpose of a Tender Type, only check or uncheck the Tender Type you want to include as options. ***
***