OK. I think this does what you want.  It was more complicated than originally explained because some of the Hydrozones actually have multiple areas that have to be summed together.   Copy everything thing in the code block below and paste it into a new blank Vectorscript editor window named "SumField2FromField1Match"   In the Database header row enter a formula of:   =RUNSCRIPT('SumField2ForField1Match', 'IrrigationHydroZone', 'Hydrozone Name', 'Area', B17)  
    • Like
    1