Hi @John Funk,
Check out this page, specifically:
You can limit the set of users available in your user picker field. The users can be limited to users in specific groups and/or project roles.
Navigate to the Custom Fields page, locate the desired custom field and choose cog icon >Configure.
Click Edit User Filtering.
Click Enable group or project role filtering, then specify the groups and/or roles that you want to limit the user picker to.The user picker will only show users that are in the groups and roles selected.
Hope this helps
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