You can use the Links Hierarchy plug-in for Jira 5+ or above. It builds virtual links for Epics and subtasks in the fly and displays those hierarchies on an interactive HTML 5 graph.
[UPDATE]: The plugin was fully re-engineered in the 3.0 version dropping Flash support and replacing it by awesome HTML 5 graphs furthermore a lot of other improvements (new filters, performance, new HTML 5 matrix view,...)
You can group stories by Component
or you can use Epic (or invent your own) custom field
If you really need a separate issue of Epic type you may consider this plugin https://marketplace.atlassian.com/plugins/au.com.efficiencysolutions.jira.plugins.hierarchy
The latest Greenhopper patch includes the Epic Report, showing status of all epic-related from Report view. I think it still does not show subtasks. https://confluence.atlassian.com/display/GH/Viewing+the+Epic+Report
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