How do I find out the amount of US bond income that TT exempted from my federal return?

TT "Learn More" screen says: "When does exempt US bond income apply? If you had income from interest or dividends on US obligations (bonds) or securities that is exempt from federal taxes, you'll need to add that income, minus expenses, to your Virginia state return." So, presumably TT in my fed return exempted US bond income that was reported on the 1099 form that it asked me to upload. What is that number? How do I find it? (Why doesn't TT provide a link in the state return questionnaire to the federal return it has just prepared?)