The report shows the hierarchy of issues (Project -> Story -> Test Run -> Test Scenario ->Action Step -> Step Unit -> Defect)
A. Trace by Story.
Select option Trace by Story, then select the Story.
B. Trace by Test Case
Select option Trace by Test Case, then select the Test Case.
C. Trace by Defect
Select option Trace by Defects, then select the Defect(Bugs).