I want to add another company to my account which is based in India

I'll help you subscribe to a new company, Stephen_logan721.

In QuickBooks Online, one account or company equals one subscription. Let's get you subscribed:

1. Visit our website.
2. Scroll down, click Select a Country, then choose India.
3. Select the plan that suits your business, then purchase.

You can add the new company under the same QuickBooks Online account. It lets you easily switch from one file to another. 

Once done, you can get started with the new account. I'll share some tutorials that can help you: QuickBooks Video Tutorials.

Let us know if you have other concerns. We'll get back to you as soon as we can. Take care!

@stephen_logan721 

You should open QBO India version

https://quickbooks.grsm.io/India