You can create a Message configuration from within the Project, and you can also link an existing Message configuration from another Project to your Project. See
Linking components into a Project for information on how to link a Message configuration to your Project, and
Structuring Projects using Global, Sub, and Main Projects for information on when to do so.
The name of the Message configuration should follow the naming standard used in your organization, for example include the document type (invoice, order, etc.) handled by the Message configuration.
Now you have an empty Message configuration. To complete the Message configuration, you must add and configure the Events and Processes. See
Message configuration procedures for information on how to configure a Message.