Cart Page

Cross-sells are products that you promote in the cart, based on the current product.

They are typically complementary items. For example, if you are selling a laptop, cross-sells might be a protective case or stickers or a special adapter. Or if you’re selling a ninja t-shirt, they could be a ninja hoodie and ninja socks.

Depending on your theme template, they display on the cart page underneath the cart products table with a thumbnail image.

Please view the link below for more detail about Cross-Sells.

https://woocommerce.com/document/related-products-up-sells-and-cross-sells/#section-2