Instructions to setup related, up-sells and cross-sell products:
Step 1:- Login to your admin panel.
Step 1:- Go to CATALOG > Products and click on it.
Step 2:- Open the product by click on edit button.
Step 3:- On the product edit page expand the Related Products, Up-Sells, and Cross-Sells tab.
Step 4:- Click on Add Related Products button and select products.
Step 6:- Then click on Add Selected Products button.
Step 7:- Now click on Save button to save your changes.
Step 8:- At last clean your cache and refresh your product page to view your related and upsell products. Cros-sell will be visible on cart page. So, first, you need to add a product to your cart to view cros-sell.
Step 9:- In the same way you can set Up-Sell Products and Cross-Sell Products.