o display Categories page user have to click on category name - top menu, left menu. In GrandNode you are allowed to add unlimited number of categories or sub-categories. All of sub-categories will be displayed in the drop down top menu. On this screen user is able to search and view products assigned to specified category.
The same actions users have to do when they want to display Manufacturers. They should click on the left block menu. There you can add unlimited number of manufacturers and assign them specified products (as shown on the image below).