It would be great to define relationships between user stories and then surface this information in the story details modal.
Sometimes a specific user story is relevant in more than one journey: so you create a primary story and then duplicate it somewhere else in another journey (secondary story). Or, before you can begin work on a user story, its dependent user stories must be completed first.
The relationship should be able to have different types (i.e. "is dependent on", etc) so we can easily see how they are connected.