[otrs] Multiple sites with LDAP accounts.

I am wondering how I would go about setting up multiple LDAP authentication methods. I have multiple sites with accounts on Active Directory. I want to be able to have them login to OTRS via LDAP. I currently have LDAP setup for the local office I work out of. With not being overly familiar with the programming of OTRS, how would I go about adding the other sites into the config to allow them to authenticate into OTRS? Let me know if you need any more information. Thank you, Wes Sothard