Learn how to manage multiple company files.
You can have multiple companies under the same QuickBooks Online account. Each company file is its own paid subscription, but you access them with the same sign-in info. This lets you quickly switch between companies so you can manage everything more efficiently.
Move existing company files to same account
If you have multiple companies under separate accounts in QuickBooks Online, here's how to move them all into one account.
Add a new company
Visit the QuickBooks pricing page and select the subscription option you want. When you are on the login page, select the Sign in link next to Already have an account? With the same credentials you have for your current company. If you want to have two separate sets of credentials, enter a new user ID.
Follow the on-screen instructions to create a new company file.
Switch between company files
Whenever you sign in, QuickBooks asks which company file you want to open. To switch between companies when you're in QuickBooks, select Settings 
and then Switch company.