Until a Service is created, the design workspace is unavailable.
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.
For more information, see How to edit a WSDL file and How to assign a data service Job to a service operation.