/Append-Image /ImageFile: /CaptureDir: /Name: /Description:Description /ConfigFile: {[/Bootable | /WIMBoot]} /CheckIntegrity ...

/Append-Image /ImageFile: /CaptureDir: 
  [/Description:Description] [/ConfigFile:] 
  {[/Bootable] | [/WIMBoot]} [/CheckIntegrity] [/Verify] [/NoRpFix] 

  Adds another image to a WIM file. 
  Use /ConfigFile to specify the location of a configuration file that lists 
  exclusions for image capture and compress commands. 
  Use /Bootable to mark a Windows PE volume image as able to be booted. 
  Use /WIMBoot to append a WIMBoot configured image to a WIM file. 
  Use /CheckIntegrity to detect and track WIM file corruption. 
  Use /Verify to check for errors and file duplication. 
  Use /NoRpFix to disable the reparse point tag fix. 

      DISM.exe /Append-Image /ImageFile:install.wim /CaptureDir:D:\