The simple solution is just don't enter the 1099-Q, in TurboTax (TT), since you know none of it is taxable.
But, if you do enter the 1099-Q, in TT, one of the first questions is who is the student. When you select someone not listed here or a beneficiary that's not a dependent on this return (the wording varies), you will be given a screen to enter his expenses, including room and board.
