B and 2 are two separate codes and must be entered individually in the two drop-down boxes on TurboTax's 1099-R form. Codes B and 2 together mean that the distribution was from a Designated Roth Account in a qualified retirement plan (B) but is not subject to an early-distribution penalty despite you having been under age 59½ at the time of the distribution (2). The likely reason a plan administrator would know that the distribution is not subject to an early-distribution penalty is because you were age 55 (age 50 for a Public Safety Officer) or older in the year that you separated from service from this employer.
