I agree with Just_me. You can definitely have multiple companies under one QuickBooks Online account.
Take note that each company you create needs an additional subscription, but you'll access them using the same login credentials. This lets you switch between companies so you can manage your books efficiently. Follow these steps to add a new company:
You’ll see a page that asks you to create an Intuit account to buy QuickBooks. Scroll all the way to the bottom and look for the small text that says“Adding a company to an existing account.”
Select Sign in, then enter the same ID and password you already use for QuickBooks.
Fill out all the information about your new company.
Follow the on-screen instruction to complete the process.
To help set up your new company file and learn how to manage multiple companies, you can read these articles:
One QBO account is for one company file. You can utilize Location feature in QBO Plus to manage divisions/branches. Otherwise, you should signup for a new QBO account for your second business.
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