You may have to explain more for anyone to know what you are talking about. What prompted your question? Where are you seeing that?
Does "date of div/sep" mean date of divorce/separation?
What form are you filling out that asks for that? i.e., on what form is the "line 2b" you refer to? Or what topic?
If you don't get an answer in this user forum, we can tell you how to phone TurboTax Support during business hours.
