Is it possible to filter and sort by a second -child taxonomy?
You have a Post with the main category "Food", then you have an additional or secondary category "Spicy Food".
So when you're sorting there would be multiple posts under "Food" but only certain types of "Spicy Food".
And the filter would be separate from the main filter for ease-of-use.
If it would require too much customization do you have any plugin to recommend for achieving this easily?