Question: How do I enter quick payments/factoring fees?
Answer: On the Pro version, once the invoice has been created, you will click Enter Payment from the Invoice page. Toward the bottom, you will see a "quick payment/factoring fees" section. You can choose the category (or create a new one), enter the date, enter the amount, and the amount type (either percentage or dollar amount).
For example, for 5%, type 5 into the amount field, then select percentage for amount type.
Then, click Add quick payment/factoring fee. This will also transfer to the expense tab at the top.