All subtask Ticket Transition to 'x' status on parent moving to 'x' status.
If Parent ticket moving from 'x' status to any other, automatically all subtask move from 'x' status to 'y' status.
Is this possible using the ScriptRunner plugin?
This is definitely possible with ScriptRunner. You could add a post-function to your transition that checks to see if the issue has sub-tasks and then transition them along with the parent.
I would look at this example on our website since it is almost exactly what you're looking for:
You'll need to change the actionID in that script to the one that you want to transition the sub-tasks to.
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