Setting up volume discounts
MYOB Accounting Plus allows you to enter a discount percentage for every line item on your item sales. You can set a default discount percentage for each customer who receives a standard discount, and you can change the discount percentage for line items that receive a higher discount, for example.
If you want to set a default percentage that will appear for all of a particular customer's line items using the Volume Discount % field in the Selling Details view of the Card Information window.)
Keep in mind that these discounts are for volume purchases and similar incentives, but are not for early payment for sales on account. Those discounts should be reflected in your credit terms.