Hello. I'm in the process of acquiring a DBA (doing business as) for myself. Once I get it, can I just add it to my existing QB Self-Employed account? Or even just update my account entirely? Do I have to make a new account for it?

I can share some information on how to add another business account, @couto558.

One QuickBooks Self-Employed (QBSE) account is equivalent to one self-employed business. If you have multiple self-employed businesses, then I suggest subscribing to another QBSE account. It can only track income and expenses throughout the year and estimate quarterly tax payments for a single business. 

To know more on how it works, check this article: QuickBooks Self-Employed Overview.

You can create a new account using this link: New QuickBooks Self-Employed account.

Let me know if there's anything that you need or if you have any other concerns with adding a new business account. I'm always here to assist. Have a great rest of the day!