It sounds like you may need a 2nd Group Header Band and Group Footer Band.
For the Group header band you could set the group expression to something like {Datasource.CutWidth}_{Datasource.CutHeight} and Set the Group header band height to zero.
Then place a group footer below the databand and drop a field on for {Sum(Datasource.QTY)}
New User Question: How to total within a grouping
New User Question: How to total within a grouping
I will give that a shot... Thank You!