I want to be able to give a discount for each line by just asking once. I know i can go to selling details in the card information and put in a volume discount but i have some customers who get a 10% discount on some invoices and a 5% discount on others. Some of the invoices are 10 or more lines and you have to go down each one and put in the discount. I want a button at the top of the discount to ask you if you want to apply the discount to each line of that particular invoice.
"Discount on invoice"
