It's great to have you here, @shezimlu-aol-com.

I can definitely guide you in adding a second company under your existing QuickBooks account. Let's get started!

1. Go to: https://quickbooks.intuit.com/za/.
2. Scroll down to the QuickBooks Comparison chart
3. Select the version of QuickBooks you want to use.
4. Click either Buy Now or Free 30-day Trial button. 
5. From the sign-up window, click the Add another company link. 
6. Enter your existing Intuit login credentials. 
7. Follow the prompts to complete the signup process. 

Just a heads-up, each QuickBooks company file is considered as two separate subscriptions. Thus, it is billed separately. However, it shares the same login credentials. 

Once the second company is successfully setup, you can easily switch between your two companies. Here's how:

1. Click the Gear icon.
2. Select Switch Company on the fourth column.

Always feel free to leave a post below if you have other questions about managing your QuickBooks company files. I'm just a few clicks away.