A Service consists of a WSDL file and one or more data service Jobs. Data service Jobs address all of the different sources and targets that you need for data integration processes and combine them with Web services. The properties of each WSDL objects and data service Job components require to be configured individually, in order to function properly.
This feature is not shipped with your Talend Studio by default. You need to install it using the Feature Manager. For more information, see Installing features using the Feature Manager.
For more information, see Editing a WSDL file and Assigning a data service Job to a service operation.