You can convert between a message map and a submap in order to change the usage of the map. You might convert a message map to a submap because you want to reuse the same mappings for multiple nodes. Use the following instructions to convert a message map to a submap for each message in the message map.
To convert a submap to a message map, click Add or Remove Headers and Folders for the source and target messages, and select to map Selected headers. You must ensure that no other maps call the changed map, check for errors in the Problems view to indicate this problem. See mapping headers and folders for more information about mapping headers, Properties and the LocalEnvironment.