Unity - Scripting API:

public function AddChild(motion: Motion): void;

public function AddChild(motion: Motion, position: Vector2): void;

public function AddChild(motion: Motion, threshold: float): void;

Parameters

motion	The motion to add as child.
position	The position of the child. When using 2D blend trees.
threshold	The threshold of the child. When using 1D blend trees.

Utility function to add a child motion to a blend trees.

This function pushes an Undo operation.