I have the following formula in cell AI2: =IFERROR(INDEX('EOL MATRIX'!$C$5:$C$144,MATCH('ALL SITES (3)'!K2,'EOL MATRIX'!$B$5:$B$144,0)),INDEX('EOL MATRIX'!$C$5:$C$144,MATCH('ALL SITES (3)'!M2,'EOL MATRIX'!$B$5:$B$144,0)))
It searches column K for a match and if one is not found, it then...