=[@[upgrade mrc]]-[@[current total mrc]]

[rentonhighlands]

Hello:
This is my formula
=[@[UPGRADE MRC]]-[@[CURRENT TOTAL MRC]]

When the upgrade MRC cells are blank how can I make the result blank? In other words there would be no difference because there is no upgrade MRC.

Do I need to add a , "" or a ISBLANK I tried ISBLANK and it produced false. I just want to the result to be blank.

 

[Fluff]

How about
=IF([@[UPGRADE MRC]]="","",[@[UPGRADE MRC]]-[@[CURRENT TOTAL MRC]])