Hi there, @Ketch1.
I hope all is well. You can add custom fields in Desktop to include new fields like a merchant fields. The steps below will show you how:
- Go to the Lists menu and choose Item List.
- Double-click any item on the list to open and edit it.
- Select Custom Fields, and then push Define Fields.
4. Name your custom field in the Label column.
5. In the Use column, pick the checkbox to turn on the custom field.
6. Hit OK to save the custom field.
Now you have a new custom fields for your merchant services charges. You find this article helpful as well: Create and use custom fields.
Feel free to drop a line below if you have any other questions. Best wishes!