using turbotax online, where do i enter room & board expenses to account for some of the funding withdrawn and shown on my son's 1099Q form?

the only college expense i was able to add was for books. there is no area to add room & board expenses and these amounted to 75% of the difference between the 1098T 1. Payments for Qualified Tuition and Related Expenses and 5. Scholarship or Grants. So right now I am paying taxes on $16k of 529 distributions which should be offset by Room & Board expenses.