401A INPUTS

NEW requirements this year for my 30 year old 401a. Turbotax asks what method I used to calculate the taxable amount. Duh! ---The 1099R says what it is in box 2a. It also asks for 30 year old data on my contributions (I need a time machine.) 

I am considering faking this by reducing the gross amount to the taxable amount, but looking for better suggestions.

Thanks, folks.