@mokkapati naveshchowdary You will need to use a 3rd party add-on like "Jira Miscellaneous Workflow Extensions" to achieve this. The specific workflow post-function provided by this add-on that you can use in the workflow of your Sub-task issue type is "copy field value from parent issue": https://innovalog.atlassian.net/wiki/spaces/JMWE/pages/68878488/Copy+field+value+from+parent+issue
NOTE: This is a paid add-on for JIRA Server.
Hope it helps !
Is there any possibility to solve by using JSU??
@mokkapati naveshchowdary You can also solve this use case by using the below post-function from "JSU" in your Sub-task issue type workflow:-
https://confluence-apps.beecom.ch/display/JSU/Copy+Value+From+Other+Field+Post-Function
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