Can I promote ‘linked purchases’, ‘related products’ or ‘you might also like…’ on my online shop?

It is possible to add a relationship between specified products on your eCommerce website. This means that customers will be made aware of any related products when viewing or purchasing a product. This includes products within the same category; however, it is possible for you to select and manually link products together to provide this functionality.
WooCommerce Frequently Asked Questions