Script Logic - Nested Loop with months

Hello Gurus,

I'm having trouble defining a nested loop with months.

My version is BPC 7.5 MS
I need that when a value was inserted on category 'EXECUTED', and on Time '%YEAR%.JAN',

the loop rec this value on category 'CALCULATED', and on Time '%YEAR%.FEB', '%YEAR%.MAR', '%YEAR%.APR'...and so on.

if was inserted another value on category 'EXECUTED', and on Time '%YEAR%.FEB',

the loop rec this new value on category 'CALCULATED', and on Time '%YEAR%.MAR', '%YEAR%.APR', '%YEAR%.MAY'...and so on.

ex:

                              JAN        FEB      MAR     APR     MAY     JUN      JUL     AUG

EXECUTED           1000      2000     3000

CALCULATED           -        1000      2000    3000    3000      3000    3000     3000

Does anyone have any idea, how I could ride this loop?

Thanks