(Please note that the solution uses a blend between SA’s language of “Team” and the National/International usage of “Division”)

A Member’s account is most commonly going to be some form of “bucket account”.

For South Australian Members this will be the following:
Staff - St John Ambulance SA
Volunteer - Volunteer Bucket Account - SA
Trainer - St John SA - Trainers Account

In some cases a volunteer member may belong to an account for their workplace.

A Member’s Current Division (Primary Team) is the primary team that member belongs to.
For non-volunteer Staff this field will most likely be “State Staff”,
otherwise, choose the team that most appropriately reflects the member’s primary belonging and activity.