I'm trying to solve this problem - I want to make drop-down list for 4 cells with this rule: if none of other three cells have value "J", then drop-down shows one choice: "J", but if any of other three cells has "J", then drop-down would show "N/A" or the cell is locked for editing. Basically, only one of those four cells can have "J". It's easy to make this in Excel, but spreadsheet doesn't allow to have drop-down and formula together. Can anyone help with workaround considering easy copying (I have lots of those four cell sets)?
Thanks!