To verify my understanding, are you currently using payroll services with Bank of America and plan to switch to a subscription that's compatible with QuickBooks Online?
If so, you'll be able to activate payroll services with Intuit while signed in.
Here's how:
In your left navigation bar, go to Payroll.
Access the Employees screen.
Click Get started to initiate a new subscription.
Follow your onscreen instructions to finish creating the account.
I've additionally included a detailed resource about working with Intuit payroll services which may come in handy moving forward: QuickBooks Online Payroll Hub
I'll be looking forward to hearing back from you. Have a wonderful day!