Employer plans (401k, 403b, 401a, 457, and others) are not IRAs and are only reported on your W-2.
Are you contributing to a pre-tax 401(k) and a private Roth IRA outside your employment, or are you contributing pre-tax funds to a traditional 401(k) account and after-tax funds to a "designated Roth account" within the same 401(k) plan? If a private Roth IRA, you can report that separately, but if you have a designated Roth option account within the 401k plan, that is already reported on your W-2 and you don't enter it again.
