Hi @Ed Green,
I think the workflow-condition "Sub-Task Blocking Condition" is there out of the box.
Add this condition to the workflow steps, which are leading to the status "Done".
If there are open subtasks then, you won't see the closing transition of the parent issue.
You can not make it out of the box. You would need an addon. For example, if you have Adaptivist ScriptRunner, then you can use "All sub-tasks must be resolved" condition. You can read more here
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