TfsConfig collection /attach /collectionDb: ; /collectionName: /clone /mappingFile: Attaches a detached collection database. ...

Visual Studio 2013

TfsConfig collection /attach /collectionDb:; 
                    [/collectionName:] [/clone] 
                    [/mappingFile:]

            Attaches a detached collection database.
            If collectionName is specified then the collection will be renamed
            to the new name and the name will also become the new 
            virtual directory for the collection.
            If the clone option is specified then this collection will be 
            created as a clone of the original detached collection.
            When importing a collection that was exported from Visual Studio Online,
            the mappingFile option must be supplied and point to a file that maps your
            cloud identities to your local identities.
            
TfsConfig collection /detach /collectionName:

            Detaches a collection from the Team Foundation Server.
            The collectionName parameter is required and specifies
            which collection will be detached.

TfsConfig collection /delete /collectionName:
    
            Permanently deletes a collection from the Team Foundation Server.
            The collectionName parameter is required and specifies
            which collection will be deleted

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