Working with Layers

At some point we're going to have a single map with everyone working on different parts of it so we should all get familiar with the concept of layers in CE3 Editor. Basically it's possible to create external layers which hold stuff and modify them without affecting other stuff. Here's an overview of layers:

Using Layers

There's also a chapter called Utilizing the layers for multiple developer collaboration  in Cryengine 3 Cookbook.

I think a good way to learn about them (and about proper CE3 development in general) is to see how they are used by Crytek. So if you have Crysis 2 install Crysis 2 Sandbox Editor and look at the original Crysis 2 levels. There's plenty of things to learn from them.