Add existing software customization code to new upgraded app version

Hi there, i need someone to add existing customized code to new upgrade version app. it is same web script the old is 2.2 version and 3.03 new version . You need to inject existing customized code to the newer version software. it may not take more than 30-60 mins for an expert. i also need some minor customization like , removing tax module from existing code. ONLY BID IF YOU ARE EXPERT IN JS, PHP AND SMARTY /HTML