Adapting the post#2 formula re:H
=SUMPRODUCT((Incidents!$A$4:$A$500=$A$1)*(Incidents!$C$4:$C$500>=$A3)*(Incidents!$C$4:$C$500<=DATE(YEAR($A3),MONTH($A3)+1,1))*(Incidents!$H$4:$H$500))
I myself prefer the double unary approach which is marginally quicker:
=SUMPRODUCT(--(Incidents!$A$4:$A$500=$A$1),--(Incidents!$C$4:$C$500>=$A3),--(Incidents!$C$4:$C$500<=DATE(YEAR($A3),MONTH($A3)+1,1)),Incidents!$H$4:$H$500)
See the link in my sig for more info on Sumproduct.
In XL07 you would use SUMIFS in this instance (significantly quicker):
=SUMIFS(Incidents!$H$4:$H$500,Incidents!$A$4:$A$500,$A$1,Incidents!$C$4:$C$500,">="&$A3,Incidents!$C$4:$C$500,"<="&DATE(YEAR($A3),MONTH($A3)+1,1))
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