In my previous company, I worked with our JIRA Software admins to create multiple "structures" (I believe this was the terminology/feature name used in JIRA) project templates, each incorporating existing JIRA hierarchy (Project, EPIC, Task & Sub-Task). Each structure had 50-200 JIRA issues manually added so that it looked somewhat like a 3 level deep MS Project Plan.
Once the "structures" were created, any new "real" project was created as a clone of one of these "structures" and all of the 50-200 JIRA issues were automatically added to this new project.
Once the project was created, the PM (me) updated the individual issues to assign them to a group/individual. Reporting project status in Confluence was super easy via JIRA macros.
Question... I cannot seem to find this "structure" feature (other than in Atlassian Marketplace)... are "structures" still part of JIRA Software?