For Install images: - WDSUTIL Options /Replace-Image /Image: /Server: /ImageType:Install /ImageGroup: /Filename: /ReplacementImage ...

For Install images:
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WDSUTIL [Options] /Replace-Image /Image: [/Server:]
     /ImageType:Install
     [/ImageGroup:]
     [/Filename:]
     /ReplacementImage
         /ImageFile:
         [/SourceImage:]
         [/Name:]
         [/Description:]

[/ImageGroup:]    The image group containing the image to be
                                    replaced. If not specified and only
                                    one image group exists on the server,
                                    that image group will be used by
                                    default. If more than one image group
                                    exists on the server, then the image
                                    group must be specified.
[/Filename:]             If the image cannot be uniquely identified
                                    by name, the file name must be specified.
/ReplacementImage
 /ImageFile:         Specifies the full path and file name of
                                    the new WIM file.
 [/SourceImage:]        Specifies the image to use if the new WIM
                                    file contains multiple images.
 [/Name:]                     Sets the display name of the image.
 [/Description:]       Sets the description of the image.


EXAMPLES:
---------
To replace a boot image:
WDSUTIL /Replace-Image /Image:"WinPE Boot Image" /ImageType:Boot
/Architecture:x86 /ReplacementImage /ImageFile:"C:\MyFolder\Boot.wim"

WDSUTIL /Verbose /Progress /Replace-Image /Image:"WinPE Boot Image"
/Server:MyWDSServer /ImageType:Boot /Architecture:x64 /Filename:boot.wim
/ReplacementImage /ImageFile:\\MyServer\Share\Boot.wim
/Name:"My WinPE Image" /Description:"WinPE Image with drivers"

To replace an install image:
WDSUTIL /Replace-Image /Image:"Windows Vista Home"
/ImageType:Install /ReplacementImage /ImageFile:"C:\MyFolder\Install.wim"

WDSUTIL /Verbose /Progress /Replace-Image /Image:"Windows Vista Pro"
/Server:MyWDSServer /ImageType:Install /ImageGroup:ImageGroup1
/Filename:Install.wim /ReplacementImage /ImageFile:\\MyServer\Share
\Install.wim /SourceImage:"Windows Vista Ultimate"
/Name:"Windows Vista Desktop" /Description:"Windows Vista Ultimate with
standard business applications."