To enter Box 7 as 2B, an early distribution, exception applies, and a designated Roth account distribution, check the box to indicate that you have more than one value in Box 7. TurboTax will accept both codes this way.
For more information about the meaning of each code, see: IRS 2020 Form 1099-R Distribution Code Guide
And in case you are taking this early distribution due to the pandemic, see: What is Form 8915-E Qualified 2020 Disaster Retirement Plan Distributions and Repayments?
