It's a subset of the products, because they need to have extra information set up for them like product photos.

There's two ways it could be set up, which are either "promotions" (if the two things appear anywhere on the same bill, they're automatically grouped) or "recipes" (choose one item from column A and one item from column B). I suspect the real ciders are simply left out of the right categories by whoever does the data maintenance, maybe because they change frequently.