Hi ZJH
I'm a bit lost as to some of your description - e.g. "When I add a WSDL file to SOAP UI, the default Endpoint is same with the WSDL." - i dont know what you actually mean by this - if youre saying that when you add the .wsdl in - the endpoint defined is what's defined in yoru .wsdl - that totally makes sense! - .wsdl stands for 'web service description language' and essentially defines the essential (and optional... depending on your .wsdl content) attributes that defines your web service.
Your .wsdl specifies an endpoint - that's the endpoint you're using.
Essentially a .wsdl file is actually created by running a process against your webservice - so whatever endpoint is specified in your .wsdl should be the correct endpoint.
You mention the 'old' endpoint in your web config file is different - I can't comment on this - all I can say is that the .wsdl is generated from your webservice - so you should be using the endpoint defined in that.
you state that you noticed in the old web config file an extended URL is defined - but seeing as the .wsdl defines your webservice and is fact generated from it - I wouldn't alter your endpoint at all unless your developers say otherwise - and even then - if the endpoint (the URI, not the server part) is actually different to what's defined in yoru wsdl - its unlikely to work anyway - because as I say - your wsdl is generated FROM your webservice itself.
hope I've been clear,
cheers.
rich