Yes I understood your problem and I have solution for you, As you said You need summarized the so sheet data in one sheet in which three columns will be same and you just want to change the overtime i.e you want to add all overtime of all the employees for a month in summarized sheet. For that you have to combine
Code:
SUM and VLOOKUP
=SUM(VLOOKUP(C2,Sheet1!$B$2:$F$3,5),VLOOKUP(C2,Sheet2!$B$2:$F$3,5),VLOOKUP(C2,Sheet3!$B$2:$F$3,5),VLOOKUP(C2,Sheet4!$B$2:$F$3,5),VLOOKUP(C2,Sheet5!$B$2:$F$3,5),VLOOKUP(C2,Sheet6!$B$2:$F$3,5),VLOOKUP(C2,Sheet7!$B$2:$F$3,5),VLOOKUP(C2,Sheet8!$B$2:$F$3,5),VLOOKUP(C2,Sheet9!$B$2:$F$3,5))
Here you just have to change the matrix and sheet name and expand the above given formula to 30 sheets and then drag down the formula for other employees one by one.
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