how do i build configuration variable of WebServiceSettingBean

Hi,

I am using invoke webservice activity on workbench to consume a webservice. I have wsdl and working fine if i set this wsd as literal value. But when i try to set\create a configuration variable , i dont see any WebServiceSettingBean type.

I want to make this wsdl url as configurable from admin ui.

Please let me know how do i create a variable of  WebServiceSettingBean type.

Regards

Sunil