i'm totally new to Shopify and I'm in the process of setting up my first shop. I've ran into something that must be very simple to solve, but I haven't been able to find the answer. Here goes. My shop sells telephone accessoires products and phone cases. When a customer picks a certain product they can then choose to add a phone case to that product. All the products are different, but all the phone cases have the same variant, but I have to put in the phone case variants separately on every new product page. My question, is how do I manage the phone case inventory, for each individual product page so all variants come from the same stock?
Check this app called "Connected Inventory" (https://apps.shopify.com/connected-inventory). It helps you manage shared inventory. They have an excellent support as well, in case you need clarifications before installing the same.
Hope this helps!