Magento Open Source 2.2.x
Up-sells

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).”


Upsell

To select up-sell products:

1. Open the product in edit mode.
2. Scroll down and expand the Related Products, Up-Sells, and Cross-Sells section. Then, tap Add Up-Sell Products.

Add Upsell Products
3. Use the filter controls to find the products that you want.
4. In the list, mark the checkbox of any product you want to feature as an up-sell product.

Upsell Products
5. When complete, tap Add Selected Products.