windows epos software with native mobile app

i have a windows Epos software already and i could able share the exe work on any windows.i want to create same features i have and add some extra features. I can provide the database but need to be redesign for the new app. The System runs on Windows XP, Windows 7 or above. i have created 50% of backoffice UI and need to add extra forms and ribbon control instead of drop down menu . till UI need to be created based on exe i provide. you can create the software based on the exe i provide and add some extra features. i have uploaded mobile app screen shots samples. i want to make the till and backoffice run on different machine independently with own sql [login to view URL] each system need to sync data in real time. till app should work with any receipt printer ( "usb"or "serial") this is a ongoing project and i need support for longer period. for this POS project i need all the "source code". after finishing this project i will pay $400 year just to maintain the code and add some extra features. 4 Type of hardware involved [login to view URL] printer [login to view URL] drawer [login to view URL] Pole Display [login to view URL] scale Software [login to view URL] back office [login to view URL] Till [login to view URL] native App 4. Iphone native app we need to do a sample report or basic. 1. stock report (on hand)> by Category > 2. Stock Movement by Transaction 3. incoming stock report (On Order) with Sales Report: 1. Sales Report 2. Sales Report By SALES MAN 3. Sales Report Per Till 4. Item Sold Report