[otrs] New Ticket - Customer History Key

I would like to use the customerid field to sort tickets by department for the customer company tickets view. Unfortunately, the customer history view when creating a new ticket appears to use this field instead of the customerkey field. Is there a place to edit which field is used for customer history? If not, is there a way to use customer groups to manage the company ticket view? Additionally, when using LDAP is there a way to implement the groupdn into a search field? Thanks! Robert