@ chen3840 asked: "Do I enter SSA-1099 in the group of 1099-R?"
No. Social Security SSA-1099 has its own interview category. I'll assume you are using Online TurboTax. Here are 2 ways to get to it in the Online version. The first way to get there is shown in the image below:
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Or here's another way to get to the SSA-1099 interview:
With your return open, go to top right corner and click the Search tool (magnifying glass).
In the search box enter SSA-1099 without quotes. Ignore the dropdown suggestions that appear spontaneously as you type. Instead click the adjacent magnifying glass that is inside the search box.
It should then present you a blue link Jump to SSA-1099. Click that.
The next screen should say "Did you receive Social Security Benefits or Railroad Retirement Benefits in 2024?" If so, click YES.
Next screen: Indicate you had Social Security Benefits (SSA-1099).
Then a form will open up with boxes to enter your data.