cumulative sum of cumulative output

[anat]

Hi,

how to implement below scenario in qlikview

time	sal	cumulative sum		required output
period 1	100	100		100
period 2	10	110		210
period 3	20	130		340
period 4	100	230		340

if i select period 1 o/p=100

period 2 o/p=210(100+110)

period 3 o/p=340(100+110+130)

Regards

............

[anbu1984]

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