Good day, paupackdiner-gma.
I'm here to share some information about having multiple company files to your QuickBooks Online (QBO) subscription.
QBO allows only one company per subscription. You will need to sign up for a new account for the second company. Which means each company has its different QBO account. However, we can use the same login credentials when signing up and switching between companies.
You can switch between companies by clicking the Gear icon and then select Switch Company.
You can take a look at this article for more information when adding a new company: Create or add another company.
Let me know if you need help. I'll be around to guide you.