If you'd like your Box Office Channel to be able to issue Access Tickets, as well as Access Customers via Website login, then follow these steps:
1. On your Price Table, create 2 sets of Access Variants - one for the Website Channel, and one for Box Office.
2. Add the Visibility Rules and Basket Validation to the Access Variant for your Website Channel
3. Create a separate Band for Access and only create a price Variant for Access (leave it blank for Standard tickets)
4. On your Price Profile, assign the seats you want to restrict to Access customers by adding the Access Band to those seats
This will mean that, combined with your Visibility Rules, means that only Box Office and Access customers on your Website can access these seats.