I am a board member with a 501 c 3 public charity that was created as a separate entity from the private foundation that has run the organization. The private foundation and public charity are separate organizations (companies) in QuickBooks desktop, so that's all set. 

However, the private foundation would like the admin for the public charity to be a different individual than the admin for the private foundation and would prefer that the admin for the public charity not have access to the foundation's financial records. What would be the best way to accomplish this separation?  Buy a new copy of QuickBooks desktop for the private charity? 

Note that the bookkeeper will be the same person for both the private foundation and public charity, but the admin is not the bookkeeper for either the private foundation or public charity. 

Thank you for your assistance.