это составляет 20 листов, даже если они еще не существуют:
=QUERY({
IFERROR('1'!A2:C, {"","",""});
IFERROR('2'!A2:C, {"","",""});
IFERROR('3'!A2:C, {"","",""});
IFERROR('4'!A2:C, {"","",""});
IFERROR('5'!A2:C, {"","",""});
IFERROR('6'!A2:C, {"","",""});
IFERROR('7'!A2:C, {"","",""});
IFERROR('8'!A2:C, {"","",""});
IFERROR('9'!A2:C, {"","",""});
IFERROR('10'!A2:C, {"","",""});
IFERROR('11'!A2:C, {"","",""});
IFERROR('12'!A2:C, {"","",""});
IFERROR('13'!A2:C, {"","",""});
IFERROR('14'!A2:C, {"","",""});
IFERROR('15'!A2:C, {"","",""});
IFERROR('16'!A2:C, {"","",""});
IFERROR('17'!A2:C, {"","",""});
IFERROR('18'!A2:C, {"","",""});
IFERROR('19'!A2:C, {"","",""});
IFERROR('20'!A2:C, {"","",""})},
"select Col1,sum(Col3)
where Col1 is not null
group by Col1
order by sum(Col3) desc
label sum(Col3)''")
![0](https://i.stack.imgur.com/GlLSX.png)