Hi there, @JZang.
It's nice to see you in the Community. I'd be happy to help share some information about using the same login for two QuickBooks Online accounts.
Yes, that's possible. You can sign up for new QuickBooks Online account using the same login credentials.
Here's how to subscribe to another company:
- Go to: https://quickbooks.intuit.com/online/.
- Choose the version of QuickBooks that best fits your business.
- You can buy now or sign up for a 30-day free trial.
- Since you already have an account with Intuit, select the Add another company? located at the top of the screen.
- Enter your Email Address (User ID) and Password.
- Select Add new company.
The following article contains more information about this: Create or add another QuickBooks Online company.
If you need additional help, feel free to reach out to our Customer Care support. They can use the screen sharing tool to help you get this resolved quickly.
Here's how you can reach them:
- Sign in to your QuickBooks Online account.
- At the top right, click the Help icon.
- At the bottom, click Contact Us.
That should point you in the right direction today. Feel free to add a comment below if you need additional information. I’m here to help. Have a great day ahead.