Hi there, @arnold. I appreciate you for reaching out to our Sales team about managing accounts, and I'm here to clear things out about the subscription in QuickBooks Online.
In QuickBooks Online, one subscription is equivalent to one company only. It means you need to pay a subscription for the accounts added to QuickBooks. This also ensures that all your data like reports are separate for each entity and taxed differently when you migrate to QuickBooks Online.
These references describe in detail how to move from QBDT to QBO and what happens to your data after the conversion process:
Since you have multiple companies, you can now manage them by using one user ID and switching between companies. To switch between any time, select the Gear icon and select Switch company. Check out this article to learn more about the process: Sign in to multiple QuickBooks Online companies with one user ID.
Let me know if you have any questions about managing your accounts and subscriptions by leaving a comment below. I'm always glad to help in any way I can. Have a great rest of the day.
