To set the selection mask to only select top level nodes (roots)
- Click the Select by hierarchy and combinations icon in the Status Line (toolbar).
- Set the selection mask to Root.
To set the selection mask to only select only nodes without children (leaves)
- Click the Select by hierarchy and combinations icon in the Status Line (toolbar).
- Set the selection mask to Leaf.
To select all nodes under the selected node
- Select Edit > Select Hierarchy.