We are using SCP v14, and I would like to convert my existing support reps to use AD authentication (and only my support reports, not my contacts), without losing any of the existing tickets / history associated with them.  And I'm not interested in scheduled imports of users - I just want to pick my support reps and that is it.  The v14 documentation for this does not match what I see in any of the user interfaces, nor does it address migrating existing users from local authentication to AD authentication.

Please advise.