AI Brain
The AI Brain allow you to create a graph to link into your AI Component.
[Serializable, CreateAssetMenu(fileName = "CubeAIBrain", menuName = "AI/CubeAIBrain")]
public class CubeAIBrain : AbstractAIBrain {}
When your AI Brain script is created just use the Unity contextual menu to instantiate it.
Double click on the new file and you will access to the xNode graph window.