See the thread below.
https://ttlc.intuit.com/community/taxes/discussion/how-can-i-make-the-mtm-election-for-the-next-year...
You might have an issue trying to enter the information in Part II without doing overrides (which voids various guarantees) in Forms Mode. Ultimately, you would have to mail your return.
Otherwise, TurboTax does not support the M-T-M election. There may be a method of entering transactions during the interview that would appear in Part II (4797), but it would be in an unrelated section of the program.
