How do I add multiple sizes to print products?

To add different sized print products (e.g. posters, yard signs, etc.), you will need to add the different sizes as different products.

This is different from apparel products (where you can add multiple sizes to one product).

So for example, if you want to sell posters in 11″ x 17″ size and 16″ x 20″ size, they will need to be added as 2 separate products.