At present it is only possible to merge an External Assessor account into another ePortfolio account. To do this you will need to contact the support team (via the Support page in ePortfolio) and indicate the username and email address of your main account and your external assessor account.
We are not able to merge other types of roles, such as Supervisor into Supervisor, Trainee into Trainee, Admin into Supervisor, and so on. We are currently investigating the feasibility of more complex merges such as these. Trainee to trainee account merges are particularly difficult and an alternative solutions are being explored.