I Have report like this

Nu.     PO           Order           Delivered            Status
1.     001            10                 5                      Open
2.     002            5                   5                      Closed
3.     003            3                   3                      Closed
4.     004            2                   0                       Open

I need to create summary information like :

Total
-  PO :   4
- Closed  = 2
- Open    = 2

Status is from formula (Order-Delivered >0 then Open Else Close)

Thanks a lot,