Steps for the presentation of hierarchical data with nested self-referential relationships in Power BI:
Define a Self-Referencing Table: Your model data must have self-join and contain a self-referencing relationship where ParentID and ChildID exist together within the same table.
Use Hierarchical Field: In Power BI, drag the relevant fields (for example, ParentID, ChildID, Level) into the Hierarchy field well.
Enable Drill-Downs: The Matrix or TreeMap visuals display the hierarchy, enabling intuitive drill-downs. To make them work, set up the hierarchy properly in the Fields pane.
Optimize Navigation: Add a slicer or filter to control the visible hierarchy levels, improving the user experience.
This approach enables clear visualization and easy navigation of nested hierarchical data in Power BI.