Calculating item rate automatically based on item total amount...

Calculating item rate automatically based on item total amount...

Currently, it seems that there is no way to add an item to an invoice, enter a quantity, and then enter a total amount for that quantity and have the software calculate the item rate automatically. Instead, you have to choose your quantity and guess at the item rate until you figure out a combination that matches the item total that you're looking for. Does anyone know a way around this?