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When appropriate users (or teams) are added by using mentioned above buttons, then its members will be able to see dedicated menu, presented on the top oft this page.
After clicking on "Add Supervisor", or "Add user" you can also add Jira's whole team. By doing so, if you've upgraded from 1.2.x to 1.3.x, then it's possible to add to teams previously made groups, with already added people:
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Next Vacation Manager HR Management - Managing holidays and workdays
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