/Split-Image /ImageFile: /SWMFile: /FileSize: /CheckIntegrity Splits an existing .wim file into multiple read-only split ...

/Split-Image 
  /ImageFile: /SWMFile: /FileSize: 
  [/CheckIntegrity] 

  Splits an existing .wim file into multiple read-only split WIM files. 
  Use /FileSize to specify the maximum size in megabytes (MB) for each 
  created file. 
  Use /CheckIntegrity to detect and track WIM file corruption. 

    Example: 
      DISM.exe /Split-Image /ImageFile:install.wim /SWMFile:split.swm 
        /FileSize:650