Under 3.05 of the Rules a person may supervise a trainee if the person is an Australian lawyer engaged:
a) in legal practice; or
b) as a Government, corporate, commercial or community legal officer
and who is working principally in Victoria, who has worked as either or both of a practising solicitor or practising barrister for a total of at least 5 years (of which at least the 3 years before the person commences to supervise a trainee were spent in either or both of practice as a solicitor, or working in the manner of a solicitor.)
Please note that currently, the Board of Examiners requires any proposed solicitor not holding a current practicing certificate to seek approval of the Board of Examiners in order to supervise a Trainee under the Rules.
Under the Rules (Rule 3.08(3) a supervisor can only supervise one trainee unless they have prior approval from the Board of Examiners. The Board of Examiners have produced guidelines for supervisors wishing to supervise more than one trainee. View the guidelines (pdf).