Caw FAQ's........Links to Tutorials, and Resources. Textures, & Troubleshooting

I'm really sorry if this was already discussed on this thread but I just don't have time to read through it all. I need to know how to change the world number or whatever it is. I made changes to a world I had previously made and basically turned that world into a completely different world. I'd like to keep both worlds by changing the world numbers of if I have to would I just have to delete my first world to keep my remodeled one?