In order to use the product options we have created we have to assign the product option to a listing or product. This simplifies the setup in that we can manage one product option and assign to multiple listings. Each listing can have as many product options as required but only one instance of the product option is allowed per listing. Editing a product option which is assigned to mutliple listings will affect all listings that the product option is assigned to.

An example of the listings edit screen where we apply a product option.