Based on prior responses to where/how is Treasury Bill Interest reported so that it is not included in State taxable Income, the answer seems to be to report it in Box 3, not box 1. How/where is the tax WITHHOLDING on treasury Bill Interest reported?
Disappointed that Turbo Tax has still not resolved this problem in their software.
If you do have withholding from a 1099-INT for your Treasury Bill interest you can enter the federal withholding in the 1099-INT entry by selecting the check box 'My form has info in other boxes (this is uncommon).'
If it is not on a 1099-INT use the following steps below.