title: How to get sum of groups in crystal report 10?
body: <p>I have a report with for some invoices and each invoice has some lines like this :  </p>
  
  <pre><code>invoice1 2000
       line1   300
       line2   700
       line3   500
       line4   500
  invoice2 1000
       line1   300
       line2   400
       line3   300
  </code></pre>
  
  <p>Now, when I use summary for group#1, I should get 3000 as sum of group amount.
  but it shows me 11000 <em>(4X2000)+(3X1000)</em> because it sums invoice lines!<br>
  what should I do?</p>