I agree with @MinhT1 , just don't enter it. You risk making mistakes. When the box 1 amount on form 1099-Q is fully covered by expenses, TurboTax will enter nothing about the 1099-Q on the actual tax forms. But, it will prepare a 1099-Q worksheet for your records.
Here's another reference:
IRS Pub 970 states: “Generally, distributions are tax free if they aren't more than the beneficiary's AQEE for the year. Don't report tax-free distributions (including qualifying rollovers) on your tax return”.
If you still want that work sheet: after entering the 1099-Q, you enter your expenses later, in the program at the educational expenses (1098-T) section. To get the screen to enter Room & Board, answer yes when asked if you have book expenses.
