I want to create a calculated field

[Anonymous]

I want to create a calculated field only when the feature is closed and the deploy date has been enter.

In my table, there are Feature State Column where it shows different states like Active, Closed, etc. and Deploy date column.

[Greg_Deckler]

@Anonymous Are you talking about a column or measure? You cannot conditionally "create" a column. You can only have a column/measure that either returns a value or returns BLANK, for example. So, maybe something like:

Column =
  IF([Feature State] = "Deploy",<some calculation>,BLANK())