Show filters only for some categories.

Hi Laraship, Here is an example. Let's say, I sell cars and motor oil in one shop. One category has it's own attribute, thus, filters. Another category - its own. When I go to 'cars' category, I don't want to see a filter for products in 'motor oil' category, such as oil quality and purity. I don't actually sell cars neither oil. It's just an example, that shows how important filter separation is. Now in my store, I have such a conflict and I can't even imagine how to solve it. Thanks very much for your help.