...
Structure-Project Management at Scale is one of the most popular add-ons in the marketplace. It is mostly used to create hierarchy of issues. Configuration Management Toolkit Jira provides 4 different “Group by” operation that can be used within a structure:
...
Groups issues based on direct parent component of the issue (parent component of the issue’s component).
...
Group by Subproject
Groups issues based on direct parent project of the issue (parent of the issue’s project).
...