title: How can i merge header cells in Excel writer in pentaho?
body: <p>I am trying to merge header cells columns into one cell but when i do that my data also comes in one column. I want my resulting output as per this screenshot attached. Kindly help me for this. </p>
  
  <p><img src="https://i.stack.imgur.com/5VxsT.png" alt="Figure: Excel table"></p>