[otrs] associate customer to company?

I am using OTRS 3.0.4. Is there a way to associate a customer to a company? I found a thread saying that if you first create the company that you should then find a field called "Company ID" in the Add Customer screen, but I do not see such a field. Thanks, Daniel CONFIDENTIALITY NOTICE: The contents of this email are confidential and for the exclusive use of the intended recipient. If you receive this email in error, please delete it from your system immediately and notify us either by email, telephone or fax. You should not copy, forward, or otherwise disclose the content of the email.