When the Form 1099-R is reporting the sum of rollovers from a traditional 401(k) to both traditional and Roth IRAs, you must split the Form 1099-R into two for entry into TurboTax, one for the portion rolled over to the traditional IRA and the other for the portion rolled over to the Roth IRA. If you had no after-tax basis in the traditional 401(k) (nothing in box 5 of the Form 1099-R), that would mean one From 1099-R with $80,000 in box 1 and $0 in box 2a for the rollover to the traditional IRA and $5,000 in boxes 1 and 2a for the rollover to the Roth IRA.
(With no after-tax basis in the traditional 401(k) it would have been more straightforward to have rolled the entire amount to the traditional IRA and then done a Roth conversion of $5,000 from the traditional IRA. That would have resulted in two Forms 1099-R, one for each transaction.)
