Currently, when you add a new Gelato product to your Shopify store the product will automatically be assigned to a dedicated Gelato Shipping profile to allow you to reflect the shipping cost that Gelato will charge you to your customers at checkout.
For example, in the screenshots below, you can see small posters shipping profiles with 5 product variants connected.
If you want to offer a different shipping cost to your customers for specific products, for example free shipping, you will need to create a new shipping profile in Shopify and manually assign your products to this new shipping profile.