505664 php form

Need php form made. Database is structured as follows: Order table, with order ID and customer details. Item table where items ordered are associated to seperate orders by item ID. So need a form to add orders to my dbase. The prices are all sourced from the dbase and based on ranges but need option to override ranges (delivery fee, product price, deposit, security deposit) and enter custom price, a bit like magento. Also, the editing order functionality should be like the form to add orders, so can edit customer details and add/edit/delete items ordered. Very simpel project, preferably should be done in ajax.