Retirement tax questions

No, the 401(k) --> traditional IRA rollover was one transaction. A distribution from the same traditional IRA to a Roth IRA was a separate transaction. Both transactions were reported on one 1099-R (same institution). That 1099-R correctly reported the IRA --> Roth IRA as taxable in box 2a.

I entered that 1099-R into TurboTax, but the taxable amount in box 2a did not transfer to lines 4a and 4b of the federal 1040.