T-bill interest is reported on form 1099-INT.
Federal tax withheld is reported in box 4 of form 1099-INT.
In TurboTax Online, when you enter your form 1099-INT, on the entry page, put a check mark next to My form has info in other boxes (this is uncommon).
Other boxes will appear and you'll enter Federal tax withheld in Box 4.
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