I'm brand new to the forum (and also to zimbra)

I will need to migrate the actual groupware from Lotus Notes 6.5 to Zimbra.
On Notes, I have many data on the anagraphic DB, but I will need few data on the new zimbra.
I'm wondering how the migration run: I mean
- Do I can decide wich field to migrate from the source Notes DB or is a standard wizard?

Maybe the question is a little bit confused.I apologize.