Deletes all lab objects in a specified team project collection. TfsConfig lab /delete /collectionName: /external /noprompt ...

Deletes all lab objects in a specified team project collection.

    TfsConfig lab /delete /collectionName: 
                        [/external] [/noprompt]

    Removes all lab objects for the specified team project collection.
    When the /external option specified, /delete will also remove
    the objects from System Center Virtual Machine Manager (VMM).
    You must specify the /collection option with the /delete option.
        /collectionName:
            Required. Specifies the name of the team project collection on
            the application-tier Team Foundation Server.
        /external
            Optional. When specified, deletes the objects from VMM.
        /noPrompt
            Optional. When specified, does not display progress and result
            data in the command window.