Retirement tax questions

What you describe is a IRR (In Plan Rollover) from a 401(k) to a Roth 401(k) (called a Designated Roth.   Unless the 401(k) contained after tax money then the box 1 amount would be taxable.

When entering the 1099-R the code G will ask if it was a rollover of a 401(k) to Roth 401(k) - answer YES.