Since many of my clients are non-profit organizations, I offer them a rate discount for certain design services. Is there a way to track discounts so I can see how much I've discounted throughout the year? 

Also, I'd prefer to show the discount AFTER the subtotal so the actual billable total is shown, as well as the discounted amount. It's important to do that to show value of my services. Is there a way to do that?

Thanks so much in advance.