250614 Multiple Categories products

I need to have a functies where productlistings will show u in multiple categories. example: categories: Cars cars by color cars by type car 1 is red and is cabrio. so must show up in cars, in categories cars by color red, and in type cabrio i found this contribution, but its not easy explained, and already got errors, so better ask somebody who know oscommerce and mysql better than i do. [login to view URL],1537