Can I add a second company to my profile?

Yes, you can. I'll share some information on how you can add a second company file for your other business in QuickBooks Online (QBO). 

In QBO, you can add multiple companies to your account. You can also create and access it with the same sign-in information to easily switch between companies. However, each company you create must have a separate subscription.

Here's how:

1. Go to the QBO plans and pricing page.
2. Scroll down and select the subscription option you want.
3. Next, click the Sign in link if you have an Intuit account. If none, fill in the needed details to create one.
4. Then, follow the on-screen steps to finish the setup. 

For reference, check out this article: Create or add another company file to QuickBooks Online. 

I'll include this helpful resource that you can use as a guide in managing the interface of your QBO account: Get started and adjust settings after you sign up for QuickBooks Online. 

You can always post again here if you have other concerns managing your company in QuickBooks. Have a good one and stay safe.