title: SSRS Count grouped rows
body: <p>I have a report where i'm trying to SUM row counts (or SUM count ID) per group.  I'm not sure how to do this in SSRS.  The report looks like below </p>
  
  <p><img src="https://i.stack.imgur.com/yOzKf.png" alt="enter image description here"></p>
  
  <p>and I'm trying to create the highlighted area in red.  How can this be done?  The problem is the rows above the red area are already in a group... </p>
  
  <p>I've tried Count("Group1"), =Count(ContainerID) but when i do count on the ID field it's giving me a count on ALL the records in the data set and not what's above... Any ideas? I've inherited this report and have been asked to make changes to it... </p>