I need to create an automation rule, for when an issue is in done, and a new sub-task is added to it, and the task returns to the to-do status
Hello @Emerson Moreira
Welcome to the Atlassian community!
Please show us what you have constructed so far for the rule, and point out the part where you're having a problem.
If you have not built anything yet, please try after reviewing the documentation for Automation for Jira.
Link to documentation for Jira Cloud:
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