Jayneel Patel: Simplest way to implement this would be to have a static Discount Field on every order between the subtotal and or total fields. Could be the same style box you are using now to the right of the Rate value. This way you can type a numerical value in that box and it would apply the discount towards the order total instead of individual product. I would like the ability to make the % symbol clickable so you can toggle it to flat numerical value discount and percentage discount. Wouldnt hurt to add the existing feature you have where when you click in the discount box it would bring up your pricing list so you could also apply your custom made price list discounts to entire order also. When creating a manual order I could click the rate text on header bar and it would bring up my price list allowing me to discount all the products at one time how come that is disabled when trying to edit an order?

If you do implement this and in this way can you also add a static shipping field, Its strange to me that we have to add shipping as a line item when creating an order. I attached a screen shot of what I think every order should have by default. The shipping, discount, and tax fields are editable because subtotal is calculated by invoice line items and final total calculated by subtotal + Shipping - Disc + Tax. You could make the discount box toggle between flat rate value and percentage by clicking on the $ symbol or % symbol. If you were really awesome you would also allow us to apply our custom price list to entire order when editing them.