Hello there, maggy02,

We can easily create another company using your existing QuickBooks Online login credentials. Here are the steps that we need to take:

1. Log out from all of your QuickBooks account.
2. Go to this link and choose your country: https://quickbooks.intuit.com/choose-country/.
3. Select Buy now or Free 30-day trial.
4. Select again from the same buttons under the subscription you want to avail.
5. In the Sign up page, click the Add another company hyperlink.
6. Enter the login credentials you always use and select Add new company.
7. From there, you can start setting up the new company.

Every time you log in to your account, you'll now see the the list of company associated to it. Then, you'll also have the Switch option that allows you to toggle from one company to the other without logging off.

Meanwhile, you can only associate a single email address for QuickBooks Self-Employed. You'll need to use a different one if you want to sign up for a new QBSE account.

Feel free to get back to us if you need additional assist regarding the process. Have a great day!