Although you can have multiple companies under the same QuickBooks Online (QBO) account, each company needs its own subscription. I'm here to give you information regarding this matter, Michel.
For each company, you need to sign up individually and select a plan. However, you can streamline the process by using the same login credentials for all the subscriptions.
To add a new company, visit the QuickBooks price page and choose a subscription plan. This will lead to one of two results:
If logged into QuickBooks, a verification message will pop up to ask which account to use. If the account displayed is the one you want to use for the new company file, select Yes, that’s correct.
If you haven’t logged in for a while, a message will appear asking you to make an Intuit account. Only fill this out if you want to link your new company file to a new account. Instead, click Buy QuickBooks Online and select Add another company. Then, sign in with your existing QuickBooks user ID and password.