You don't. The subtasks rightly take the security level of the parent.
Technically, it's a bit of a pain to have different sub-task security levels. In the real world, humans simply don't grasp it, and you shouldn't do it because it will break for them. And your administrators would have to understand a morass of rules around it to get it even vaguely right whenever they're doing any form of setup, let alone the clever stuff like automation.
In the past, Portfolio for Jira required a high degree of detail–foresight that was unrealistic for many businesses to have–in order to produce a reliable long-term roadmap. We're tur...
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