The inverse is easily possible using the "Sub Task Blocking" condition in the workflow transition.
The one you are asking is also possible if you add a scripted condition using the ScriptRunner plugin in the workflow transition condition in your sub-task transition to the state you want. All you have to do is to check the status of the parent issue and if it is in the desired state, pass a true else false.
@Arun Thundyill Saseendran
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