How to add additional data to a register value windows from the command line

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  I'm trying to change a value in a register of windows, my question is how I can add value without deleting the original data, for example:
  
  I called value Test = ABCD
  
  I wish the new value Test is = KLMN;ABCD
  
  Add the information KLMN but without deleting the previous contents.
  
  The string value is REG_EXPAND_SZ, REG ADD've tried but can not find the correct syntax.
  
  please i need help ... someone can tell me what is the right way, I'm doing a bat file and need that command line to add a value to an existing registration information but without deleting the previous record.
  
  Thank you

  Thursday, December 4, 2014 7:57 PM