title: Sum function in Report Builder 3.0
body: <p>I am creating a report that will sum up all subtotal per MaterialNo/Color/Quality/Size.</p>
  
  <p>Here's my sample report:</p>
  
  <p><img src="https://i.stack.imgur.com/xaP0m.png" alt="enter image description here"></p>
  
  <p>Computation will be <strong>GrandTotal = sum(Subtotal)</strong></p>
  
  <p>I am using <code>=Sum(Fields!TOTAL_CTN.Value)</code> but the result is 12.</p>
  
  <p>Is there a way to compute using like <code>=sum(subtotal_TextBoxName)</code>?</p>