Hello everyone,
We've been using JIRA for some years now but we've hit a feature wall that we couldn't resolve so far. I'll explain our process in hopes that someone might have a solution.
First of all, we're using strictly time estimation for our work. Before a new sprint starts the Product Owner creates stories along with their specifications. In the grooming session for said sprint, the developers discuss the stories and then create sub-tasks for each one depending on their technical needs, while also estimating the time it would take for each sub task to be completed. The time total from the sub-tasks is added to the parent Story.
Most of the time, multiple developers will work on the same story, and each one will have a number of estimated sub-tasks in that story.
Now, the above generates some issues for us in the planning session. When adding Stories to a new sprint, in the estimation summary per assignee we only see the total time estimated for stories, and not for sub-tasks. This leads to situations where a developer will look like he's overbooked if he's responsible for or more stories, even though, in reality, that time is split between 3 or 4 developers, through sub-tasks.
Is there anyway we can see the estimated time per assignee for sub-tasks? It's becoming increasingly difficult for us to plan sprints, since we have to do the calculations by hand (also the JIRA reports become useless for us).
Screenshot with a wildly inaccurate worklog: 
