Script logic question

Hello,

I need to implement a script logic where-

WHEN TIME

IS %TIME_SET%

WHEN RPTCURRENCY

IS LC

WHEN - SUM UP ALL RECORDS FOUND AND CHECK IF THEY TOTAL OUT TO ZERO

*REC..........and so on.......

So my question is how to implement

WHEN - SUM UP ALL RECORDS FOUND(That are for time period selected and rptcurrency of LC) AND CHECK IF THEY TOTAL OUT TO ZERO

.

Thanks.