Hi, i am using QB trial version, i want to knw how we can differentiate to costcenters (two different business) under one company

Hello, userkamal-devadiga. 

Thanks for reaching out to us here in the Community. I'm here to share some insight into having multiple accounts under one company QuickBooks Online (QBO). 

You'll need to sign-up for a new QuickBooks Online account to create another company. One company file is equivalent to one subscription. But if you already have an existing account, you can use the same login credentials when signing up and switching between Companies. 

Check this International versions article, then choose your country to create a new account.  

Once finished, you can simply switch from one company to other quickly. See this how do I switch companies article for more information.  

For additional reference, feel free to check out this page for more details: Choose the accounting plan that’s right for your business. 

Let me know if you have follow-up questions by commenting below. Just tag my name and I'll get back to you. Have a great day!

@userkamal-devadiga 

One QBO account is for one company file.

https://quickbooks.grsm.io/India

As another option, you may manage multi company files with a one time license of QB Desktop.