We do all of our own printing and variation in our listings. We would like to push more into the realm of having all the options for the customer in the Customily personalization pop-up but we need to be able to attach SKUs or "products" to all of the different variations for tracking and sales data. It would be nice to be able to use something like Add Shopify Product option set without it tacking an additional product to the cart but just be used for backend data purposes.