By default, merging issues is not available in Jira. You have to use the app. Please try our Issue Merger for Jira. It allows you merge not only Epics, but every issue type which you need. We also support linked issues.
Welcome to the community, @zakynthinou !
Currently it's only possible to merge linked issues. But we really like the idea of merging also the tasks and subtasks within the epic. I already started a discussion with the dev team and it seems to be possible to implement this.
Can you get in touch with our support to share more information about your use case with us?
You can also try the full version of Merge Agent for Jira for free for 30 days. That might help to get a better understanding how the improved Epic Merge should behave in order to fulfill your requirements.
Thank you for your feedback, @zakynthinou !
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