title: Nested/hierarchically collapse and expand in Excel or other application
body: <p>I want to hierarchically collapse/expand in Excel, or if not in Excel then in any other application. e.g. I have:  </p>
  
  <pre><code>  ABC
     -abcd
     -abc1
     -abc2
        -a1
        -a2
          -MM2
          -NN2
        -a3
      -abc3
  </code></pre>
  
  <p>when what I want to see is:  </p>
  
  <pre><code>+ABC _further if I expand ABC- I should get_
  ABC
   -abcd
   -abc1
   +abc2 _likewise_.
  </code></pre>
  
  <p>I tried data Group and Ungroup in MS-EXCEL, but without success and have not found a satisfactory answer on the internet.</p>