This question is in reference to Atlassian Documentation: Get help and support
That's more of a "how do I use JIRA" question. I'd strongly advise that you take an Atlassian University course on administration.
But the specific questions:
The reason I can't give you detailed answers is that you're asking for everything. JIRA is powerful and flexible, but it can only be those things because it is complex. I can't explain the complexity without writing a book, or delivering training courses.
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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