title: Renaming column header in Excel
body: <p>I have same columns repeating within the worksheet such as  </p>
  
  <ul>
  <li>Unit ID  </li>
  <li>Unit Name </li>
  </ul>
  
  <p>several times </p>
  
  <p>I want these column headers to be changed based on their occurrences.<br>
  For eg. first occurrence of <code>Unit ID</code> will be replaced as <code>Unit ID_1</code> and second occurrence will be renamed as <code>Unit ID_2</code> and so on.<br>
  Any help will be fab!</p>