I'm using the following formula to figure out when warranties expire, [Start Up Date]@row+[Labor Warranty Days]@row. This formula works great to figure out when the warranty expires, but a certain customer has a longer warranty which is called out in a different column, how can I make a formula to show if the Labor Warranty's Days is blank, to use the Labor Warranty Days for Customer column? Or is it not possible, I didn't originally setup the SS, so I'm not sure why they have it in separate columns like that, just trying to improve it.