There are two scenarios that an auction house will need to edit this area of the software.
To edit the payment types click on the little blue arrow icon to the left of the Account Number 1010. The description for this Parent Account will say "money in or out."
This arrow will drop down a list of all current payment types available. These are the payment types you see when adding a receipt to a bidder's settlement.
To add a surcharge to a payment type, click the Pencil Icon to the left of the payment type you're editing.
On the Edit Account window that appears you will see the Parent Account listed first.
The subsequent fields will be
You can also add a flat dollar amount instead of a percentage, such as adding ($10) as a surcharge or deducting (-$10) as a discount.