Fortunately, you can right click on formulas to get a total, depending upon the formula, what you're displaying isn't the same thing though.
A simple way to accomplish what you want is to add in additional formulas:
detail a 1 * 25 25 25
detail b 5 * 30 150 175
detail c 5 * 5 25 200
The second column (qty*cost - which you represented with values instead of fields) I'll assume is just representative of the formula used for the Total, so I'll ignore that.
The Running Total for Detail A is the same as the formula, so just use it.
Now for the running total on the B detail, use:
(qty*cost)+(qty1*cost1)
Now for the running total on the C detail, use:
(qty*cost)+(qty1*cost1)+(qty2*cost2)
Grand Total is everything.
etc.
-k
kai@informeddatadecisions.com