Removing 1st Domain Controller in Domai

When I created my first domain controller in W2k I used a PC class workstation, Now I have five additional Compaq servers that are domain controllers. I now want to get rid of this PC class domain controller, but it is the primary. What do I have to migrate over to one of the additional servers? Also how do I do this migration. I have already made one of the additional domain controllers the global catalog server.