There are two options for setting discounts on Purchase Orders: Unit Discounts and Order Discounts
To create a unit discount on a Purchase Order, specify the discount amount based on unit pricing. If the discount is $1.00 per item, put 1.00 in the Unit Discount field when creating a PO.
Note: This should not affect the Unit Costing, and is considered a one time price override.
Purchase Order Discount:
Alternatively, you can apply a discount to an entire PO. Enter the desired amount in the Discounts field and click Save Changes.