I'm not quite sure what you need exactly.
You could simply use an Issue Type Scheme that only includes these issue types in the project if you only need Sub-Bug and Question.
An option would be to use a transition on the parent issue that links to the same status and creates a linked issue with the required type – you could simulate a Create Issue screen by using the Transition screen and some custom fields that are only used to copy the values to the new issue. On that transition you could also add User Is In Roles or User Is In Group conditions if you need them.
Sadly, JSU does not have a User Group Validator or something like it yet, which is necessary to check the issue on the create transition.
You'll find more information on the create linked issue transition in our documentation: https://confluence-apps.beecom.ch/display/JSU/Create+a+Linked+Issue
Also our helpdesk is always open if you need JSU-specific support: https://servicedesk-apps.beecom.ch/servicedesk/customer/portal/3
Pre-receive hooks that verify the Git commit message, the modified files, and implement similar code change controls used to be requirements of large enterprises working in regulated industries only....
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