I would like to see an option that would allow us to provide selected invoices with special discounts on what is currently listed as the "sub total" value of their invoices. Discounts should be calculated as a either percentage of the subtotal value or as a fixed amount (my choice). Here is an example:
Sub Total $1,000.00
Good Customer Discount (5%) 50.00
Quantity Discount (10%) 100.00
Revised Sub Total 850.00
Tax (10%) 85.00
Eligibility for these discounts should only apply to orders created through the admin interface.