Navigation:  System Setup (F4) > Sites > File Override Tab

FILE OVERRIDES:  Sites can share databases with other sites, as defined in the File Overrides.  The Doctors, Forms, Devices, Generic Dictionary, Address, Templates, MPI, Orders and Users can all be shared.  For example, if there are multiple sites, but all of the same providers, you can create an override to the site where the providers are set up.