CB dropdown fieldtypes have no feature to add optgroups (something for a future release). This can only be done through API or raw HTML.
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You'd need to write a new plugin, probably fieldtype plugin if you want it as a field. You'd then need to review moscomprofilerHTML usage in comprofiler.class.php (see various plugins as most are using it somewhere). For example see GroupJives admin.cbgroupjive.php and find the showConfig function and you'll see how it constructs a dropdown select array.
Kyle (Krileon) Community Builder Team Member Before posting on forums:
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-- If you are a Professional, Developer, or CB Paid Subscriptions subscriber and have a support issue please always post in your respective support forums for best results!
-- If I've missed your support post with a delay of 3 days or greater and are a Professional, Developer, or CBSubs subscriber please
send me a private message
with your thread and will reply when possible!
-- Please note I am available Monday - Friday from 8:00 AM CST to 4:00 PM CST. I am away on weekends (Saturday and Sunday) and if I've missed your post on or before a weekend after business hours please wait for the next following business day (Monday) and will get to your issue as soon as possible, thank you.
-- My role here is to provide guidance and assistance. I cannot provide custom code for each custom requirement. Please do not inquire me about custom development.