Edit Quanlity Discount

Hi Everybody,

I have a problem with fixing the amount of the discount. Currently I am using 2 program discount.

  1. Discount 2% (default program)

  2. Discount Buy 6 pay 5. Charged on invoices (The program will change in months)

I want edit change quality discount but can not be made. Please see attachment photo and for me one solution.

Thanks very much.

Best Regards,