I am trying to determine an efficient method for transferring the ranking of portfolio item features to the user story backlog. I have the features ranked just how I need them. Each feature has several user stories that implement it. If the features are ranked A, B, C, D, and E, and then in the portfolio view I rank the user stories for each feature properly in the context of that feature, how to transfer that implied ordering of the user stories to the user story backlog? In other words, I want the user stroy backlog to at least start off ordered as A1, A2, A3, B1, B2, B3, C1, C2, D1, D2, D3, etc.
Basically, how do I insure that the backlog at the user story level reflects the feature level prioritization?