Try this in A4 dragged to the right. If the monthly number is odd, it adds 1 to the first monthly value (i.e. if the total is 81, you'll get 41 and 40)
Does this work for you?![]()
=IF(MONTH(A3)=MONTH(B3),ROUNDUP(HLOOKUP(A3,$A$1:$D$2,2)/2,0),ROUNDDOWN(HLOOKUP(A3,$A$1:$D$2,2)/2,0))
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