title: ssrs sum group totals for specific groups and subtract for specific groups
body: <p>I have a report like this:</p>
  
  <p><a href="https://i.stack.imgur.com/PEKVF.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/PEKVF.png" alt="Expenses SSRS report"></a></p>
  
  <p>I have grouped on group name called expense type. Ideally expense type has three types, 1, 2 and 3. I have used them to sum up in TOTAL in blue line.</p>
  
  <p>Now I want to add the total of totals to brown tan line,</p>
  
  <p>I want ( (total of group 1 + total of group 3 ) - total of group 2 ) in the tan color total billing submitted.</p>
  
  <p>Can anyone help me in writing this expression?</p>