You might want to have a look at these:
https://answers.atlassian.com/questions/59671/copy-parent-issue-custom-field-value-into-new-sub-task
https://answers.atlassian.com/questions/53815/copy-field-from-parent-to-sub-task
https://answers.atlassian.com/questions/98331/how-to-prefill-a-subtask-field-with-info-from-parent
https://answers.atlassian.com/questions/60922/prepopulate-subtask-fields-from-the-parent
There's now a very easy to configure way to keep fields for parents and sub-tasks in sync using Automation for JIRA!
You can easily modify related issues (such as parents, stories, sub-tasks, epics, linked issues and even JQL) using our related issues action and condition:
(this example updates the description, but pretty much any field can be edited)
For more details see https://blog.codebarrel.io/synchronize-parent-and-sub-task-issues-with-automation-for-jira-bdcca6c9d453
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You can also use the commercial add-on Workflow Essentials for JIRA to copy fields from parent to sub-task.
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