Yes, you can manage two separate company file in QuickBooks Online. You can use the same login credentials when signing up and then just switch between the existing companies.
Also, please note that QuickBooks Online only allows one company per subscription. If you want to create multiple accounts, you'll need to sign up for a new QBO account.
In case you don't use the same login credentials, you'll have to use another email account for this.
On the other hand, in case you want to find an accountant to manage your books and provide suggestions based on what's more suitable for your business, you can find one by going to this link: https://quickbooks.intuit.com/find-an-accountant/.
I've included these articles that will help you in managing your QuickBooks accounts:
One QBO account is for one company file. You may manage divisions/branches by utilize the Class/Location feature available on QBO Plus and Advanced. Otherwise you can purchase more than one QBO account with the same email address.
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