We use JIRA to track time and create Epics and Stories under a Project. We link the stories using the linked issues field. I have 2 questions. 1. What is the difference between using "contains in" versus "relates to" in linked issues? 2. When we are logging time to an issue, we would like the time logged to roll up to the Epic or a project to figure out the total time spent on the Epic or Project. Which "linked issue" dropdown should I use for the time to roll up to the highest level issue type, ie: Epic or Project? Thank you