It is easy to suggest products in combination with others to your users on the product detail page.
Choose the product to which you want to associate the others and open its edit page.
Click on the tab “Frequently Bought Together” and add products that you want to suggest to your customers by entering their names in the Ajax search box.
There is no limit to the number of products you can add. Once you have saved your product, you and your customers will be able to see suggested products associated in the product page, immediately below the meta box; see how it looks like in the following image.