SQL Remote User's Guide
  Deploying and Synchronizing Databases
    Using the extraction utility

Extracting groups

If the remote user is a group user ID, the extraction utility extracts all the user IDs of members of that group. You can use this feature to all multiple users on each remote database, using different user IDs, without requiring a custom extraction process.

When a database is extracted for a user, all message link parameters for that user and the groups of which the user is a member are extracted.