Currently Tempo support only Jira default issue hierarchy.
Advanced Roadmaps (formerly Portfolio) provides option to add issue types in to hierarchy.
Would be good if Tempo could use full hierarchy.
example hierarchy could be
more information available eg. in https://confluence.atlassian.com/advancedroadmapsserver/configuring-initiatives-and-other-hierarchy-levels-802170489.html
|Tempo Products||Tempo Timesheets|