Logic Help

PARENT  CHILD MPO GROUP COUNTER TIME1 CAPACITY VOL1 VOL2

P1      C1    .55 1001  1       1.12  300      200  670
P2      C1    .55 1001  1       1.12  300      211  670

here only the vol1 differs because of different parent.

NOW i want it like...

PARENT  CHILD MPO GROUP COUNTER TIME1 CAPACITY VOL1 VOL2

P1      C1    .55 1001  1       1.12  300      411  670
P2       

I got the first display format...

how to change it to second.....
The problem is i should only display this in ALV Format