I use QB Desktop. I want to bill a customer for a Utility expense, but only charge a percentage of the total. I've already entered the bill and marked it billable to this customer. I created the invoice and clicked on "Add Expense". I entered -10% as I want the customer to pay for 90% of the bill. However, I'm unsure of what Markup Account to use? Do I put it back to Utility Expense since I'm not profiting off of the transaction? Or do I actually need to create an income account?

Thank you!