Creating a custom product with more than 1 SKU

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I run a POD store and my POD supplier (printify) doesn't allow more than one design for a product like socks, which is what I'm selling. I wanted to add a custom product to add different variants (such as color) but it's asking for an SKU. The product doesn't have 1 SKU, but 3 for the different sizes. (6 if you count the colors). How can I add a custom product without filling in the main product SKU?