title: Month wise cumulative total in column
body: <p>I need cumulative aggregate after each column for my report. I have a dataset with following data samples.</p>
  
  <h2><strong>ProductName</strong> *<em>Transdate</em>* <strong>Quantity</strong></h2>
  
  <ol>
  <li><p>A           21-Nov-13      100</p></li>
  <li><p>A           1-Nov-13        50</p></li>
  <li><p>A           1-Dec-13        40</p></li>
  <li><p>A           1-Jan-13       150</p></li>
  <li><p>B           11-Nov-13       30</p></li>
  <li><p>B           2-Dec-13        20 </p></li>
  <li><p>B           13-Dec-13       10</p></li>
  <li><p>B           12-Jan-13       80</p></li>
  </ol>
  
  <p>I want a report which look like below. That means Product wise each month total and Cumulative total. I am able to get month wise total value. Only need suggestion for month wise cumulative total.</p>
  
  <p>**</p>
  
  <h2>Product Nov'13 Cumulative Total Dec'13 Cumulative Total Jan'13 Cumulative Total</h2>
  
  <h1>**</h1>
  
  <ol>
  <li><p>A   150 150 40  190 150 340</p></li>
  <li><p>B   30  30  30  60  80  140</p></li>
  </ol>