Totalling

Hi,

I have data in internal table like that

f1...........f2

A1.........11

A1.........22

A2.........33

A4.........44

I wanted to display output as

f1...........f2

A1.........11

A1.........22

.............33

A2.........33

.............33

A4.........44

.............44.

How I can do that??