One QBO account is for one company file. You can manage branches/divisions by utilizing the Class/Location feature available in QBO Plus. Otherwise you should open a new account.
Setting up multiple companies in QuickBooks Online is a simple process made to save you time and effort when switching between them. I'd be happy to help go over how to set up multiple companies.
In QuickBooks Online it's recommended to use one subscription per company otherwise your financial information wont be correct when trying to pull reports or track taxes. In order to make a new subscription and link it to your account you can follow the steps in this article. Once the account is created you can switch between them by going to: Gear>Switch Company. This allows you to switch between the two at any time.
If you have any questions let us know and we'd be happy to help.
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