How I can add new company

You can use your existing email address to add a new QuickBooks Online (QBO) company. I'll show you how, nasser.

1. Go to the QuickBooks website.
2. Choose the plan that best suits your business needs.
3. Click on Sign in.
   
4. Enter your Intuit email address.
5. Select Create a new company and enter your billing information. Follow the prompts to set up your new company using your existing email address.
   
6. Click the Subscribe button.
   

Additionally, you can use this article for tips about managing multiple QBO companies: Manage various businesses. 

You can always utilize this thread if you have other concerns managing your QuickBooks companies. I'll help you anytime.