Allow me to join in this thread, @wlcummings.

I'm here to share additional information on how QuickBooks Multi-User works.

A QuickBooks Server or host computer is where QuickBooks is installed and the company files are stored and shared on your network with other QuickBooks
users. This is used for customers who have more than one user license and  running QuickBooks in multiuser mode.

Here's how to set it up:

1. Buy and install additional user seats
   1. Go to QuickBooks.
   2. Choose Manage License.
   3. Select Buy Additional Licenses.
   4. Follow the on-screen instruction to buy additional licenses.
   5. Go to QuickBooks.
   6. Select Manage Licenses.
   7. Choose Sync License.
   8. Install QuickBooks.
2. Install QuickBooks Server
3. Create user accounts
4. Start multi-user mode

For more details, you may check this guide: QuickBooks Desktop for Mac 2019 User's Guide ( Go to page 26.).

Don't hesitate to ping me if you have other questions about using QuickBooks Mac on a multi-user mode. I'm always here to help.