I would like my target completion column to have a date that is greater than my start column. Excel supports a date validation option but I do not see this in Google Sheets.
Is it there and I just don't know how to use it?
I saw this question: Restrict the valid values in one cell, based on the value in another cells but I can't see how to get it to apply to the same row in the other column. Obviously I don't want a new rule on each cell.