Standard advice - don't, you're using an unsupported and insecure version of JIRA for which there are no patches and you should upgrade and use the REST interface.
However, if you insist, there were some docs for this, but they've been deprecated and I can't find them any more. However, https://answers.atlassian.com/questions/43386 should get you started.
In the past, Portfolio for Jira required a high degree of detail–foresight that was unrealistic for many businesses to have–in order to produce a reliable long-term roadmap. We're tur...
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