HelloIt is just if something from the same brand is already in the cart. It is a product that can only be purchased alongside something else from the same brand.And yes the add to cart cta should be ridden until this criteria is fulfilled.

I want to set a particular product up so that it can only be purchased when a different item if already purchased. I want the customer to be able to pay for this item - it is not free more like an add on sale - therefore the preset promo options are ...