The Linked Products (using existing products as options) feature allows Shopify store owners to attach related products to specific option values.

Instead of showing generic recommendations, you can now upsell or cross-sell the right product at the exact moment a customer makes a choice, directly inside the option experience.
This feature helps increase average order value while keeping the buying flow smooth and relevant.
For example, we wanna sell a kit for the body as a gift box. Using Link Products to Options, you can link to other body care items.

Let’s configure it!
On your option dashboard, create a new “Button Multiple” option. For each option value, name it after a product and link to it. Also, set the price for this value.

Save the settings and repeat this for other option values if needed.
Note: What happens when an order is placed? The linked product is treated as a real Shopify product. This means that when the order is completed, the linked product is added to the cart and its inventory quantity is reduced accordingly.