The Tree Form displays a Parent-Child hierarchy.
That hierarchy can be changed by dragging and dropping nodes.
Adding a Child Node
To add a Child to a desired node, select the child node and drag it onto the desired Parent.
When the indicator shows a green arrow, release the node.
Changing a Node’s Level
To change the level of a Node, select the node and drag it onto the desired level.
When the indicator shows a curved arrow, release the node.
