There's a retirement income section on the Wages&Income page....it has separate entry lines for 1099-R (pensions, 401ks, IRAs and the like) forms and SSA-1099 (Social Security) forms.
If you are using the "Online" software, you might have to expand the page to see the whole menu (Add other Income).
Unfortunately, the software for the Pension & SS entry area isn't ready for use yet....might be a week or 2 before the software is updated to include it. You don't actually have your 1099-R forms yet anyhow, but doing pre-planning, they'll have to do so without the software.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*