Hello,

I'm new here, so I hope I've chosen the correct forum for my question. My English is somewhat poor, so please tell me if there's something that you don't understand.

I have actually different sheets from "01" to "13" that contain monthly billings. There is one more sheet (called "part patronale") that should take values from these "01" to "13" sheets. I'd like to drag the formula vertically down with only the sheet reference changing, meaning that it should begin with referring to the sheet "01", than, by dragging, changing into "02", then "03" and so on.Can you help me with that please?

Here is my formula:
=ROUND(IF($C20>$E$15;$E$15*(2*$E$9)-'01'!$J$27;ROUND($C20*(2*$E$9);2)/2);2)