I have two questions, what do layers do, and how do you use them?
Layer Help
Idontknow has an awsome tutorial on how to usr layers. I learned how to use them ion less then an hour using it.
1. Layers let you make 'overhead' stuff. Such as bridhes that link can walk both under and on.
2. Before you look at idontknows tutorial i suggest you peek around the ZC editor and look around to see the 'layers' tab.
If you are relativly new to ZC, layers may prove to be a chanllenge. They deal with stuff that requires you to know other knowledge that can only be obtained by using ZC yourself. Good luck!