godot-demo-projects/gui/control_gallery/tree.gd

@tool
extends Tree


func _ready() -> void:
	var root: TreeItem = create_item()
	root.set_text(0, "Tree - Root")
	var child1: TreeItem = create_item(root)
	child1.set_text(0, "Tree - Child 1")
	var child2: TreeItem = create_item(root)
	child2.set_text(0, "Tree - Child 2")
	var subchild1: TreeItem = create_item(child1)
	subchild1.set_text(0, "Tree - Subchild 1")