Setting up volume discounts
MYOB Accounting Plus allows you to enter a discount percentage for every line item on your item purchases. You can set a default discount percentage for each supplier who offers 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 supplier's line items using the Volume Discount % field in the Buying 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 of purchases on account. Those discounts should be reflected in your credit terms.