I'm not sure where this is being populated, but if you have a workflow for the subtask, you can use the 'JIRA Suite Utilities plugin' to update a custom field value during the initial creation of your issues. Just make sure it's the last post function that fires during the 'Create' transition.
Read more here.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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