Epic ranking and backlog item ranking and their inter-relationship are complex topics. In VersionOne Rel 12.0, epics are ranked independently from backlog items (stories).
If I interpret your request correctly, your request is that if epic A has been ranked above epic B, then epic A's stories should also be automatically ranked above the stories of epic B. Is my interpretation of your request correct?
Your request may make sense in some scenarios and VersionOne product team actually considered this capability during VersionOne Rel 12.0 design.
However, there are other scenarios where a user may not want to rank the stories consistent with epic ranking because doing so would not be in line with his business goals. For example, a user may want to rank only high-value or high-risk stories higher (independent of what epics they belong to). This kind of ranking would require a separation between story ranking and epic ranking.
As you may see, the semantics of epic ranking vs. story ranking gets complicated as different users have different needs associated with story and epic rankings. Some users need to have these independent rankings between epics and stories.
I have communicated your request to VersionOne Product Management team. You may also propose it as an idea using VersionOne Idea space.
Satish Thatte