This is my first approach to the databases and although I think it is a very intuitive application, still can't get the result I want. I made a "materials", "items", "layouts (paper sizes)" and "orders" to control a printing house's workflow. I set the first three without problems, but I understand that to make that "orders" can be repetitive with different quantities, different items, it is a many to many relationship, but at that point it already seems confusing to me. ¿Any advice?, thanks in advance.