I want to open a sister company account in my chart of account because the company is owed to sister company

Welcome to the Community, mahmoudhijazi-az. 

If you are referring to creating a subaccount, we can make a new subaccounts of any main (or “parent”) account. Use them to keep your chart of accounts organised and make more detailed reports. Here's how: 

1. Click the Gear icon on the top menu. 
2. Select Chart of Accounts.
3. Tap New. Choose the account type and detail type. You can learn more about detail types if you have questions.
4. Select Is sub-account and then enter the parent account.
5. Give your new subaccount a name. You can also add a description.
6. For the as of date, tell QuickBooks when you want your account to start. Then add the Balance to the account as of the date you choose. Only some account types need this, like a bank, credit card, asset, and liability. If you need help, you can learn more about opening balances.
7. Press Save and Close.

To learn more about this one, see the Create subaccounts in your chart of accounts in QuickBooks Online article. If you are referring to opening subsidiary company(s) in QuickBooks Online (QBO),  there is no combined reporting for financials in QBO. Each company has to be its own subscription, and there is no combined reporting for financials in QBO. What we can do is to add the sister company file to QBO. Just follow the steps and details in the Create or add another company file to QuickBooks Online article.

Feel free to visit our Account management page for more insights about running and managing your business in QuickBooks.

I'd like to know how you get on after trying the steps, as I want to ensure this is resolved for you. Please reply to this post and I'll get back to you. Take care always.

I'm here to provide insights about creating multiple companies in QuickBooks Online (QBO), asha_kanta_sharma. 

To start, I want to verify if you'd like to create two companies under one subscription in QBO? If so, this option isn't available in the program. Each file should have its own paid subscription.

For more details about this, please see this article: Create or Add Another Company File.

Also, if you have multiple companies under separate accounts in QBO, you can make things easier by using one login detail to access them.

Once you've created your companies, I'd suggest checking out these articles to learn how to manage your chart of accounts. This ensures your books are accurate.

• Learn About the Chart of Accounts in QuickBooks
• Add an Account to your Chart of Accounts in QuickBooks Online
• Create Subaccounts in your Chart of Accounts in QuickBooks Online

Please get back on this thread if you're referring to something else, asha_kanta_sharma. This way, we'll be able to provide an accurate solution to resolve your concern.

@asha_kanta_sharma 

One QBO account is for one company file. You can manage branches/divisions by utilizing the Class/Location feature available in QBO Plus. Otherwise you should open a new account.

https://quickbooks.grsm.io/Asia-Pacific