You can do it using post-function "Write field on linked issues or subtasks" of plugin JIRA Workflow Toolbox. This post-function allows field "Resolution" of subtasks to be set with a desired value, or you can also trigger a transition in subtasks to move them through the workflow to a desired status.
In your case I suppose you need to move the subtasks from a current status to another one called "Cancelled" through an existing transition in the workflow. To do it you need two actions:
Action 1: Using post-function "Copy a parsed text to a field" we write the name of the desired status (Cancelled) to an auxiliary field called "Ephemeral string 1".
Action 2: You use post-function "Write field on linked issues or subtasks" to write the value of auxiliary field "Ephemeral string 1" to virtual field "Issue status" in all subtasks of current issue.
Once configured the transition looks like this:
It seem's that pictures in my former post are missing, so I have added a post in JIRA Workflow Toolbox documentation site explaining this use case: Automatically Cancel subtasks when Parent issue is cancelled.
This a specific example of a more general use case: Automatically transition Subtasks to certain Status when Parent Issue is transitioned to another status.
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