We would love to have the ability in the checkout screen to add quantities to services. I.e. ( Extra Product charges are $XX per ounce used. If we used 3 additional ounces, that would be 3 extra product charges.). Currently we can't do that in the checkout screen. We have leave checkout, edit the appointment, and add it to the appointment, or we have to change the price however in our service report of services sold in a day, having thats numbers would help with product usage etc