Create small delivery system pages

I have 2 PHP files. One is where a user will add products to the current sheet, they enter the product code (Automatically it should display the product name from the database), then the user must input the quantity and when they are done they should click on ADD. This will automatically add the line to the summary below (invoice style), they must be able to edit a line or delete a line. When they are done adding all the products, there should be a submit button that should input the lines into a database There should be another php script where a user can input the unique code (delivery number) and pull up a previous "Delivery note", there a user must be able to add comments, be able to delete lines, modify lines and add comments to the delivery note, also be able to mark the delivery note as DELIVERED or Cancell the entire delivery note without deleting it from the database. I don't need alot of styling just the basic to make it display properly. The main language should be PHP, you can use javascript or ajax to enable the realtime update of data. If anything is unclear then please feel free to ask, you will need to make the relevant mysql datastructure where required. Each comment / delivery note created, modified ect should display what user made the changes.