The Tree viewer supports exporting the current displayed data into an Excel file and on the JIRA Issue Detail view. These options are available from the More… menu:
The Export to Excel will download an Excel file with the currently displayed issues (nodes) in the hierarchy. If an issue has its children hidden (the issue is collapsed), then the non visible children will not be exported even they are loaded in the hierarchy, but not visible.
Two alternatives of Export to excel are available:
Current fields
All fields
The "All fields" option, will export all the issue attributes available in JIRA, including custom fields.
The "Current fields" option, will export juts the same fields defined in the JIRA Issue Navigator because the premise is that most users want to see the same fields on Excel regardless the export method (Issue Navigator or Links Hierarchy), therefore Links Hierarchy takes the columns/fields configuration from the users' Issue Navigator current configuration (in the List View mode) for Excel exports: