This video will show you how to use upsell in sales orders. The items that are shown in the Upsell dialog are items that other customers have bought along with the item that is selected in the grid.
A step by step guide can be found below the video.
Steps
Upsell can be used to view items that other customers have bought alongside the item you are selling.
Green-select the item in your Sales Order.
Use the Actions button to select View Upsell Items.
Green-select any of the items shown in the Upsell dialog.