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."