I have created the following formula, however, is there an easier way to include several sheets that may contain the lookup value?
=SUMIF(INDIRECT("'"&INDEX(SheetNames,$A13)&"'!$B$21:$B$31"),$B129,INDIRECT("'"&INDEX(SheetNames,$A13)&"'!D21:D31"))+SUMIF(INDIRECT("'"&INDEX(SheetNames,$A14)&"'!$B$21:$B$31"),$B129,INDIRECT("'"&INDEX(SheetNames,$A14)&"'!D21:D31"))
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