Hey, I'm guessing that all you want is formulas on the worksheet labeled "juntar notas". If so, then remove the data validation list from range 'juntar nota'!A4:A20. Enter this formula in A4 as an array [confirm with Ctrl+Shift+Enter at the same time]
Drag down to A20, and you can protect the cells so that the formula is not tampered with or deleted. OHH, and ensure that you use the same custom text format you have in Dados!$B$2 so that it shows exactly how it appears in the Dados worksheet.
THEN, in C4:C20 enter [confirm with just Enter]:
I suggest you change the formula in C2 to this:
So that it always equal to the same day of the previous month.
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