Sub tasks for any US should be created automatically while creating a User Story.
Hello @Anvesh Chaudhary ,
Automation empowers you to focus on the work that matters, removing the need to perform manual, repetitive tasks by allowing your teams to automate their processes and workflows. With simple rule builder, you can configure powerful automation rules to handle even the most complex scenarios.
https://www.atlassian.com/software/jira/guides/expand-jira/automation
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