Since you said that you moved funds to the new Roth account, then took a distribution from this account and received a code-T Form 1099-R for this distribution, you moved funds to a Roth IRA, not to a Roth 401(k). A 401(k) is not an IRA and an IRA is not a 401(k). You must answer No when asked if you moved funds to a Roth 401(k) and on the next page answer Yes when asked if the funds were moved to a Roth IRA. Doing so will cause TurboTax to add the the amount from box 5 of the code-G From 1099-R to your basis in Roth IRA contributions.
