Up-sell products are items that your customer might prefer instead of the product currently considered. An item offered as an up-sell might be of a higher quality, more popular, or have better profit margin. Up-sell products appear on the product page under a heading such as You may also be interested in the following product(s).
Select up-sell products
Open the product in edit mode.
Scroll down and expand the Related Products, Up-Sells, and Cross-Sells section.
Click Add Up-Sell Products.
Add Up-Sell Products S
Use the filter controls to find the products that you want.
In the list, select the checkbox of any product you want to feature as an up-sell product.
When complete, click Add Selected Products.