[otrs] Manually removing multiple customer ID's on ticket creation

We have multiple users belonging to multiple companies or in our case locations. I've followed the recommended steps in the admin manual by assigning each customer the same customer ID (separated by a semi colon). When an agent opens a ticket for the Customer, the Customer ID field is auto-populated with the multiple customer ID's assigned to that specific Customer. The agent then has to manually remove the Customer ID's (locations) that are not applicable. Can anyone recommend a better solution that wouldn't involve our agents having to manually remove each Customer ID that the ticket does not apply to?