You can use existing WSDL or XSD files as the basis for your solution.
After you import a WSDL file into a container, drag the WSDL file onto the Message Flow editor to create a message flow. You need to open or create a message flow. If you are dragging a WSDL file from a shared library into a message flow in an application or other container, that container must reference the shared library. When you drag a WSDL file onto a message flow, the Configure New Web Service Usage wizard guides you through the creation of the message flow.