I want to understand this formula and see where the source data is coming from =IF(ISERROR(VLOOKUP($A6,INDIRECT("'"&O$1&"'!q:s"),3,0)-VLOOKUP($A6,INDIRECT("'"&O$1&"'!q:s"),2,0)),0,VLOOKUP($A6,INDIRECT("'"&O$1&"'!q:s"),3,0)-VLOOKUP($A6,INDIRECT("'"&O$1&"'!q:s"),2,0))
Solved by S. A. in 19 mins