To Assign Reporting managers to the Staff based on their level of hierarchy, follow the below path.
HR ---> Leaves ---> Assign Staff Reporting Managers ---> Select Branch, Department Type, Staff Departments and Level ---> Click on Get ---> Click on "Assign Reporting Manager" ---> Click on the Checkbox against a Staff ---> Select the Reporting Managers by clicking on the drop-down list under different levels ---> Click on Save.
Note: Level - 0 reports to Level - I, Level - I reports to Level - II, Level - II reports to Level - III.