Fixed pricing only for certain categories
I'm using the 'Fixed Price Per Ad' model. I only would like for the 'Ad Packs' to apply to certain categories, i.e. Real Estate, Vehicles, Services, ad Rentals and free for the rest, e.g. electronics, clothing, announcements, garage sales, and other general items. How would I go about doing that? I would really appreciate anyone's help. Cheers!