Hello there, @TL1960.

Thanks for getting back to this thread. Allow me to clarify things for you. 

The Intuit Account Primary Admin, who also serves as the Company A Primary Admin, cannot access Company B's records without permission. While the Company A admin may have control of the license, they do not have access to the data of Company B.

Moreover, I'll be sharing this link to help handle users and roles in QuickBooks Desktop Enterprise: Create and manage users and roles in QBDT.

If you have any further questions about setting up access permissions for your companies within QuickBooks Desktop Enterprise Gold, please don't hesitate to reach out. I'm here to ensure that your experience with our product meets your needs and respects the privacy and security of your company's data.