I found how to add "Epic/Theme" in the workflow of issues. How do I go about adding Themes?
See this link for more information about the hierarchy of JIRA including Portfolio.
http://blogs.atlassian.com/2015/04/jira-portfolio-fundamentals/
If you don't want to do it with Portfolio, then you can get a limited functionality out of adding a new "labels" type field for "theme". Portfolio does it a lot better though.
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