Hi there,
You'll have to add the new owner as a company admin user first and then, transfer the master admin role to him so that they can have full access and control of the QuickBooks file. Let me guide you how to add a new user:
The new owner will receive an email invite, ask them to select the link and accept the invitation to be the added on file.
Once the new user have accepted the email invite, transfer the master admin role to the newly added user using below.
Have the user complete the email invite by accepting the role as primary admin user.
Feel free to post again in the Community if you have further questions about managing users.
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