There you go Quick Subtasks for Jira https://marketplace.atlassian.com/apps/1210972/quick-subtasks-for-jira/version-history (Available for Jira Server)
Quick demonstration can be found here https://youtu.be/Stm8gEy2p98
Learn how to use two new reports for next-gen projects in Jira Cloud: Cumulative flow diagram and Sprint burndown chart. Ivan Teong, Product Manager, Jira Software, demos the Cumulative ...
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