Requirement is to have a button in issue detail view, which would create a linked Story if the viewed issue is Feature. The linked story would be a link type "is child of".
In ideal situation it would be similar to what Jira has for Epics (although it's a different thing, since Jira has built-in hierarchy for Epics in place). See the attached image. But granted that is not possible a button somewhere in the issue view having text "Create linked story" would be enough.
After creating a linked story, user should remain in the same issue (i.e. Feature) and not to be redirected to newly created story.
