Melbourne does not have a standing beit din with the expertise to deal with complicated monetary issues, which is why, in part, the case was to heard in Sydney. The demand that Don Wof choose a "borer" means that Wolf needs to choose a dayan (rabbinic judge) to sit with a member of the Sydney Beit Din and a third rabbi those two rabbis choose so the case can be heard.
Related Posts:
Chabad’s Yeshiva Centre In Bet Din Trouble Over Firing Of Long Time Staffer.