I would love to find out a little more about your situation to better understand improvements that can be made.
Accounts can be set up in a few different ways so it would be good to have a little bit more information on the task that you're doing and the purpose of referencing the meter number on the PDF bill.
Are you in the Billing tab of your account, wanting to see the Meter number alongside the Account number? Do you have 6 separate billing components in your account, with each corresponding to the separate meters that you're responsible for in your office?
Thanks in advance. You're feedback is really valuable to us so that we can continue to improve our online services.