How to set up a product that contains a creative size different from the ad serving size.
Using a Skin as an example.
Typically when creating a new product, under the old set up you would need to create the product and map it to the ad serving unit size as per:
Under the new set up you can now edit the option "Sizes", this is where you can place the creative size required.
The product will now be mapped to the ad server 1x1 but display the creative size to the buyer.