@Pusko do you mean you want to add product upsells to your themes cart?
This will vary wildly by theme especially matching the design , and also trying to let the customer pick the options on the cart if there’s more than 1 option.
From your wall of code it looks like you’ve forgotten to add the variant.id as a hidden input so it’s submitted to the cart when the add to cart button is press.
If you need this customization then contact me directly by mail for services.
Please always provide context and clear details of what’s need and examples: store url, theme name, post url(s) , or any further detail.
Contact Info in signature.
It looks like you are statically adding the three option? Are these three variants? Shopify requires variant id to add products to the cart. Also I dont see any JS that can perform the Add to cart functinality.
As this is a custom functionality, this will require custom coding.
Actually, the choice is up to the user. They can choose the option with just one variant or the second offer with the possibility of choosing 2 variants, or even the third offer with the possibility of choosing 3 variants.
I’ve just updated the code where I added the ‘Add to Cart’ button to the second offer. You can see it now
You product https://bankfarjunk.myshopify.com/products/produit-2 only has one default variant. And it looks like you are trying to make this product have three variants? For this you must first add variants to your product.