Using the TreeView style – PB Docs 2021

The TreeView presentation style provides an easy way to create
DataWindow objects that display hierarchical data in a TreeView, where
the rows are divided into groups that can be expanded and collapsed.
Icons (+ or –) show whether the state of a group in the TreeView is
expanded or collapsed, and lines connect parents and their
children.

This TreeView style report groups by manager ID and state and
lists employee information and salaries:

For more about the TreeView presentation style, see Working with TreeViews.