I can guide you through the steps on how you can create a second QuickBooks account with us. First, you need to sign-up for the service then establish your profile after.
From there, you can choose to buy and avail any promotions for the program. Click the Select button for the product you think will work for your business then click Checkout. After that, you will be prompt to sign up and create your Intuit account. This is what you will use when logging in to your QBO company file. Make sure to use the same email or user ID for the second company if you want to put all the companies in one profile.
Once done, you'll be able to see and set the company file information. I'll be leaving a few resources to help you get started with the program:
If you have any other questions or concerns about starting a new QuickBooks account, please post here again. I'll be right here to help you further with starting your QBO account. Have a nice day!
One QBO account is for one company file. You may manage branches/divisions by utilizing the Class/Location feature available in QBO Plus. Otherwise you should open a new account.