Hi, @molsen141.
I'm here to help you with creating a second account in QuickBooks Online (QBO).
QBO only allows one company per subscription to avoid fixing your forms and taxes. To add a separate business account, you need to have a new subscription under the same email address. From there, you can work with your two businesses under one login and file your taxes separately.
You can open this link and choose the plan you want to subscribe: Plans for every kind of business.
For more hints about creating a new company file and switching from one account to another, you can check out these articles:
Just in case you want to create an account from your Chart of Account, here's how: Add an account to your chart of accounts in QuickBooks Online.
If you have any other questions about handling your QuickBooks accounts, please let me know by adding a comment below. I'm more than happy to help. Have a good one!