How do you start up a second business on QuickBooks please?

Thanks for posting in the Community, instinctsupports!

You can add a second business under your QuickBooks Online (QBO) account. However, each company you create will be a separate paid subscription. Please take note that you can access them all with the same login credentials to easily switch company.

1. Go to https://quickbooks.intuit.com/au/.
2. Click on Pricing.
3. Choose a product (Simple Start, Essentials or Plus).
4. Click Free 30-day Trial or Buy Now.
5. Since you already have an account with Intuit, click Sign in or Subscribe here beside Already have a QuickBooks Online account?. 
6. Enter your Email Address (User Id), First name, Last name, and Password.
7. Click Add new company.

You an also contact our Sales team through Chat or Phone when visiting the marketing website to help you set up an account.

Drop by again in the Community if you have QuickBooks Online concerns. I'm around to help you.