I tried the following two formulas, which should be producing the same value,
but I either get a blank cell or N/A. I have copied this formula and am
positive that it should be working. The same formulas works sometime and not
other times in other cells. Is there anything with sheet calculating or
array functions that I'm missing? Thanks for your help.

{=SUM(IF(('[Rollup - Facility.xls]Scenario'!$A$5:$A$611="311")*('[Rollup -
Facility.xls]Scenario'!$F$5:$F$611="84 (AKASHI)")*('[Rollup -
Facility.xls]Scenario'!$E$5:$E$611="NACD"),'[Rollup -
Facility.xls]Scenario'!$H$5:$H$611))}

{=INDEX('[Rollup -
Facility.xls]Scenario'!$H$5:$H$450,MATCH(1,("NACD"='[Rollup -
Facility.xls]Scenario'!$E$5:$E$450)*("311" = '[Rollup -
Facility.xls]Scenario'!$A$5:$A$450)*("84 (AKASHI)" = '[Rollup -
Facility.xls]Scenario'!$F$5:$F$450),0))}