Hi,
Unfortunately, web server address cannot be changed for the already defined web service object.
If you have a reasonably small number of web servers that you are going to use during testing, then you may apply the approach mentioned here:
http://smartbear.com/forums/f75/t81090/web-service-wsdl-url-as-variable(
http://smartbear.com/forums/f75/t77029/how-to-change-the-webservice-wsdl-url-by-script)
Otherwise, I am afraid that you'll have to create the request infrastructure in code using this approach:
http://smartbear.com/forums/f75/t59793/adding-header-to-the-web-services-in-test-complhttp://smartbear.com/forums/f73/t48530/how-to-run-the-webservices-test
