TWO MASTER REPLICA IN A NW 5.1 TREE

I have got a Network with n Netware 5.1 servers and I have two master replicas on the same replica ring.
I have a master replica in a server named A and another replica master in a server named B, and now I want to put all my masters replicas in a server named C in order to change the others replicas (A,B) to Read/Write.

Thanks in advance for your collaboration

Luz Nidia Ramos Pineda
BRINKS DE COLOMBIA S.A.