Add an extension to the existing JAVA program

Offering money for a programmer. Add an extension to the existing JAVA program. I have a simple code in Java for firmware. Remake Brandi’s Bagel House app using JAVA FX and add the ability to add more than one item to each order. Then save a sales record by adding it to the data file. Add the ability to read the data file and display the check. Keep the customer data. It is also desirable to create a drawing of the finished model (not necessary)