WPC Frequently Bought Together for WooCommerce is a plugin developed by the WPClever team to help online store owners sell more products in a proficient way and promote cross-selling products across several product lines. Users can add extra items for common product type: simple & variable products or special types such as smart bundles, grouped products, composite products from WPClever developers.
These products will be served as OPTIONAL extra items that are bought together with the main product. If you would like to add REQUIRED extra items, which buyers have no choice but to get it alongside with the main product, you can kindly try WPC Force Sells for WooCommerce to add entailed services, products, or even give away free items at different predefined discounts and quantities.