how to change port in WSDL for a service reference

Hi folks,

I have a service reference and need to change its port number in difference AX instance(DEV/QA/UAT/PROD). When I modify the port number in service reference configuration, it is saved in app.config but when I regenrate the service(right click on service in AOT), the port number is overwritten by old one.  Any idea?

in QA we use 8082 but we need to have difference port number in each AX instance.