Overview:

This article explains how to put the custom field values of a parent in summary of created subtask

Instructions

Follow the below steps to put the custom field values of a parent in summary of created subtask

1. Log into Jira system as a Jira Administrator and click  > Issues  > Fields (under Custom fields). 
2. Navigate to the intended custom field and click the> Configure. You will be able to see the custom field ID in the address bar as shown in the following screen.

1. Take a note of the custom field IDs and navigate to the workflow associated with the project.
2. Edit the respective workflow as required.
3. Select a transition which has the post function with the custom field values.
4. Click the Post functions tab.
5. Click the pencil icon.
6. In Create on Transition for Jira – Create Subtask(s), click Custom Fields in the left sidebar. 
7. If you want to copy the parent issue custom field to the summary of the created subtask through create on transition, then you need to mention parent custom field as %parent_customfield_id% in the summary of Post function.