Hi Kevin,
The easiest way to do that is to add a true/false field to sys_user_group with a name like Change Group. Set the value to true for groups you want to include in the assignment group list, Then you just modify the reference qualifier for assignment_group in change_request to include Change Group Is True.
You can also add Change to the Group Type table and then assign that type to the relevant groups and modify the reference qualifier accordingly. Here's the link to the documentation on working with Group Type.
Hope that helps.
:{)
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