This plugin allows you to define and enforce product combination rules in WooCommerce.

You can set conditions such as “this product cannot be purchased alone,” “buying this product requires another specific product,” or “these products must always be purchased together as a set.” These rules can be managed directly from the WooCommerce settings page using simple text input.

Restricted-product rules and bundle-set rules can be used together. When a bundle condition is satisfied, a designated coupon can be applied automatically. Invalid combinations are detected in the cart and at checkout, preventing the purchase.

No complex customization or theme modification is required.
A lightweight and practical extension for shops that want precise control over how products are sold.