ScriptRuner - Set Resolution of all Subtasks when Parent Issue is transitioned to another status

[Callum Carlile _Automation Consultants_]

I would like to add a 'Cancelled' status to my parent issue workflow which will close the issue and set the resolution to all sub-tasks to Cancelled. I know this can be done using Jira workflow toolbox, however my client does not want to purchase any add-ons.

Is there any way this can be done using ScriptRunner? And if so, how would this be done?