To actually make it a little harder, I need to add one more detail. The product_cat categories aren’t obviously Black/White. I used those as a minimum reproducible example. The actual situation is a bit harder, in that there are two top-level categories again let’s say that their values are Black/White, but the user will be selecting one level deeper than that. So the mechanism will need to check the selected category and go one level up to find whether the selected cat has Black or White as its parent…
