Excel first in first out formula

Hi

I am looking for some help on the attached excel first in first out formula.
fifoexample.xlsx
RichardAtkAsked:
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Phillip BurtonDirector, Practice Manager and Computing ConsultantCommented:
=MAX(MIN(SUMIF(Reserved!A:A,A2,Reserved!C:C)-SUMIF(A1:A$1,A2,C$1:C1),C2),0)
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Phillip BurtonDirector, Practice Manager and Computing ConsultantCommented:
Here it is attached.
fifoexampleanswer.xlsx
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RichardAtkAuthor Commented:
Brilliant !!!  Thanks
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