IRA basis in Easy Guide and mega backdoor

In the process of reporting my current year (2024) backdoor Roth conversion, TurboTax 2024 desktop has “Easy Guide” to find my IRA basis and the information is stored on an “IRA information Worksheet” under Forms. My questions are:

1. Is using Easy Guide necessary or useful (for future years)? I already track the history of my various Roth contribution/conversion/rollover on my own.
2. I made rollover in the past from a saving plan at my employer to Roth (mega backdoor). How do I report that in Easy Guide? A possible option on the checklist is “transfer money from an employer’s retirement plan to an IRA…” Then what?

Thank you