if you dont want to show products of subcategories in their parent categories (shows only links to subcategories in menu), simply change file shop_browse_queries.php back to the starting state. But if you want to great functionality of whole virtuemart, every product have to be added to the end of some branch. If someone would be in category which have some children(in the middle of some branch) it cant works great. Try to draw it on the paper... (Of course if you want to shows only links to subcategories, not products of subcategories). If you want to show products too, thats another case, their would be shown twice (with my code editation). I hope I helped you.