Good day, Yunke.
I've got the answer you're looking for about creating another under the same QuickBooks Online (QBO) account.
One QBO subscription is only good for one company. However, if you wish to add one, you can utilize the same sign-in credentials so you can switch between companies in one login.
Feel free to read this article for more info: Create or add another company file to QuickBooks Online.
If you want to give someone access to your account with a certain role, feel free to read this article: Add and manage users in QuickBooks Online.
For additional questions about managing your QBO company files, leave a comment below. We'll be willing to lend a hand. Keep safe, and have a good one.
