Several of my products have upgrade options and several just have additonal options that are not extra charges. Can anyone tell me where I need to put the extra information in at so it can show up with the correct products and caculate the extra charges where needed? before using PrestaShop i used 1and1 and I could find it easily, but I'm not sure about locating any thing withing Prestashop as there really isn't a support document that outlines this information online.