Non-volatile replacement for INDIRECT in SUMIFS formula

Okay so I'm trying to us the SUMIFS formula to add values on a different sheet based on criteria on that sheet but I want to use a text string on the sheet with the SUMIFS formula to reference the sheet with the data on it.

My original formula was:

=SUMIFS(INDIRECT("'"&A2&"'!K4:K500"),INDIRECT("'"&$A$2&"'!B4:B500"),"=LEFT(AA1,2)",LEFT(INDIRECT("'"&$A$2&"'!C4:C500"),3),"=MID(AA1,7,3)")

However I kept getting an error and excel said that INDIRECT("'"&A2&"'!K4:K500") was volatile, so I tried to replace it with INDEX and my formula was:

=SUMIFS(INDEX(A2:A2,1)&"'!K4:K500",INDEX(A2:A2,1)&"'!B4:B500",LEFT(AA1,2),LEFT(INDEX(A2:A2,1)&"'!C5:C500",3),MID(AA1,7,3))

However INDEX(A2:A2,1)&"'!K4:K500" returns the value "1251062 EP.EL+CB-A10'!K4:K500" which wont calculate properly because of the quotation marks but excel is auto inserting them.

Oh that is a bummer.

Thank you though that does fix the code and it works now.

You're welcome.