While using interview mode I answered mistakenly "No" to a question if I track my after tax contributions. When I tried to walk back I noticed that, as result, TT deleted my previous year form 8606.
Is there way to transfer only that form again from my previous year file?
The Turbo Tax system automatically transfers the entire return upon attempting to file a new return each year; in this specific case, you will need to revisit the section in question, answer 'yes' and re-enter the appropriate information.
Would the "appropriate information" allow me to select a particular tax form?
No. You cannot just transfer the Form 8606 from the prior year. However, if for some reason it did not transfer or disappeared, you can then just enter the correct carry-over basis when the interview asks for it.