First please upgrade to CB 1.2.3, your release is out of date. I'm not quite sure what you're referring to. A userlist is not searchable by another userlist. Do you mean the fields on the userlist? Only way to achieve this is create a delimiter field and use substitutions to display the fields value then place that delimiter field on 1 userlist while placing the actual field on the other userlist. Please see tutorials within my signature for substitution usage information.