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Overview

This article explains how to create a subtask if one does not already exist for the respective parent issue using the app Create on Transition - Create Sub-task post function. 

Instructions

You need to add a Post Function in your respective workflow associated with the parent issue. Follow the below steps to create a post-function for this scenario.

1. Log into Jira system as a Jira Administrator and click Image Modified > Issues.
2. Under the Workflows section, select the workflow and click on Edit link.
3. Select the transition steps to add the post- function. As per the below screenshot, the workflow transition step working is selected to add the Post Function.

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      5. Now add the below Post Function.

6. Click Update and publish the Workflow.

7. Traverse to the issue and click on the transition steps button with respect to your workflow and you As per the above example, if you move from the transition step working to the next transition step. You will notice that the Sub-task will get created for the issue if it does not exist.

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