It is easy to suggest products in combination with others to your users in product detail page.
Choose the product to which you want to associate others and open its configuration page.
Click on the tab “Frequently Bought Together” and add products you want to suggest to your customers by entering their name in the Ajax search box.
There is no limit for 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 product page, immediately below the meta box; see how it looks like in the following image.