Hello @radlifferic-gmai,
As of the moment, the QuickBooks Self - Employed account is intended for a single small business owned by a self-employed individual.
That said, let's consider starting two different accounts with subscriptions accordingly to track your income and expenses for each business.
With this, you can start a new account with a new email address by going to our QuickBooks Plans and Pricing page. From there, you can select Self-Employed under Freelancer to start your new journey.
Additionally, I've also included this reference for a compilation of articles you can use while working with us: QuickBooks Self-Employed Overview.
If you have any other questions, please let me know by leaving any comments below. I'll be here to lend a hand.
