Setting up supplier price lists allows you to create quantity breaks for stock items that you purchase. To see how to use supplier price lists check out the following video. There are step by step instructions below the video.
Steps
Open the Promotions screen.
Select the Supplier Price List option.
Select the Supplier in the drop down.
To add to the price list, enter Edit Mode.
Use the New button to add the product.
Repeat for as many times as is necessary for the quantity breaks being offered.