For install image transmissions: - WDSUTIL Options /Start-MulticastTransmission /Image: /Server: /ImageType:Install /ImageGroup: ...

For install image transmissions:
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WDSUTIL [Options]
        /Start-MulticastTransmission
        /Image:
        [/Server:]
        /ImageType:Install
        [/ImageGroup:]
        [/Filename:]

[/ImageGroup:]
        The image group containing the image associated with the
        transmission.  If not specified and only one group exists on
        the server, then that image group will be used.  If more than
        one image group exists then the image you must specify this
        option.

[/Filename:]
        If the source image cannot be uniquely identified by name, you
        must specify the file name.

EXAMPLES:
---------
WDSUTIL /Start-MulticastTransmission /Image:"Vista with Office"
/ImageType:Install


WDSUTIL /Start-MulticastTransmission /Server:MyWDSServer
/Image:"Vista with Office" /ImageType:Install /ImageGroup:ImageGroup1
/Filename:install.wim


WDSUTIL /Start-MulticastTransmission /Server:MyWDSServer
/Image:"X64 Boot Image" /ImageType:Boot /Architecture:x64
/Filename:boot.wim