To add a complex type to your message model:
Switch to the Enterprise Service Tools perspective.
In the Outline view, right-click Types then click Add Complex Type on the pop-up menu. A complex type is added and is assigned a default name.
Either type a new name for the complex type or press Enter to accept the default.
You can now configure the local element to your exact requirements. For further information on configuring message model objects see Configuring message model objects.