Not all financial instructions are available for import, but you can import a pdf or type the information in manually.
You don't mention which type of 1099 you have, but here are the directions for manually entering interest, a very common 1099. The process is similar for whichever 1099 you have.
Open TurboTax Online and navigate to Wages & Income > Investments and Savings (1099-B, 1099-INT, 1099-DIV, 1099-K, Crypto) > Add/Edit
Under "Let's import", choose "Enter a different way."
Choose Interest, continue
Choose "Type it in myself"
Enter FEIN from payer, payer's name, and amount of interest. Choose recipient's name from dropdown box.
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