There is no plugin for it except CB Core. It's a generic implementation. If you force an optgroup it'll apply to every single one of your select fields. We also do not support core edits so I can not instruct you any further. You should create a custom fieldtype plugin to display exactly as you want. I've made a note for a future release of CB to review implementation of optgroup support.
Kyle (Krileon) Community Builder Team Member Before posting on forums:
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krileon
