First you must create a new common.ini as that tells a channel what data to load. For channel 2 change the common.ini in the worldsvr ini (CommonIniPath=Common.ini) to your new copy which should also be changed:
Code:
; Bloody Ice
[World-01]
ThreadMap=Data/Data_World/world1-tmap.bin
MobsMap=Data/Data_World/world1-mmap.scp
Npc=Data/Data_World/world1-npc.scp
Terrain=Data/Data_World/world1-terrain.scp
Make a new copy of world1-mmap.scp and change the red line in it to the new mmap file name. Now edit your new mmap file to add your boss spawn.
When doing this it is best to do the same with the world*-terrain.scp too so you can do custom drops.