How does TT calculate "amount required to be used for other than qualified education expenses, item 4 part V Student Information Worksheet? I can NOT find the data source for this and I have tried every conceivable combination of numbers to derive it.

Yes, the amount in that box is the amount you entered as spent on room & board on the screen titled, Did you pay for room and board with a scholarship or grant?

Room & board is not a qualified education expense, but it can be used to exclude excess scholarships from taxable income. 

I figured it out!  This amount comes from the step-by-step education scholarship/grants topic, " Did you pay for room and Board with a Scholarship or Grant? If you answer "no" here, then item 4 is 0.