TfsConfig import /sqlinstance: /collectionName: /confirmed Imports a TFS 2005 or 2008 data tier as a new project collection. ...

TfsConfig import /sqlinstance: 
                 /collectionName:
                 /confirmed

     Imports a TFS 2005 or 2008 data tier as a new project collection.

     Important: This command should only be executed after adequate backups 
                have been performed.

                After you import, you will need to configure portal and 
                reporting settings via the administration console.

     EXAMPLES
     --------
     TfsConfig import /sqlinstance:tfs2008sql /collectionName:imported 
                      /confirmed
     TfsConfig import /sqlinstance:tfs2008sql\Instance 
                      /collectionName:imported /confirmed
    
     OPTIONS:
     --------
     sqlinstance         The sql instance of the TFS 2005 or 2008 data tier.
                         The TFS databases at that location will be modified 
                         directly and will no longer be usable as previous 
                         version databases.  Ensure you have back-ups.

     collectionName      The name of the new Team Project Collection.
     
     confirmed           Confirm that you have backed-up databases 
                         before importing.