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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 Create on Transition - Create Sub-task post function. You  

Instructions

You need to add a Post Function in your respective workflow associated with the parent issue. 

Instructions

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 to click on Edit link.
3. Now 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.

      4. Click on Add Post Function link and then select Create Sub-task option. After this click on Add button.

      5. Now add the below Post Function.

6. Click Update and publish the Workflow.

7. Re-run the scenario and you Traverse to the issue and click on the transition steps button with respect to your workflow and you will notice that the Sub-task will get created for the issue if it does not exist.

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