In CONNECT Edition - Custom Configuration - Part 1 : Initial Creation Steps I described how the installer can be used to specify the location of your Custom Configuration by setting the value of the variable _USTN_CUSTOM_CONFIGURATION listed in "C:\ProgramData\Bentley\MicroStation CONNECT Edition\Configuration\ConfigurationSetup.cfg" to the chosen Network Configuration path; e.g.: \\hal\CONFIGURATIONS\MCE.
We also have a related variable, _USTN_CUSTOM_CONFIGURATION.
In the majority of organizations the WorkSpaces configuration level will provide the necessary granularity to support departmental or other high level business structures so a single Custom Configuration should be sufficient to meet the organization's needs for production.
However from a support perspective it is useful if not essential (and now easier!) to have a work in progress or test copy of the operational Custom Configuration.
Simply define (and this is a manual CFG edit, which is fine in an administrative context) _USTN_CUSTOM_CONFIGURATION to specify the WiP Custom Configuration, e.g.:
Once that variable is added a third option, User Configuration, will appear when selecting a WorkSpace:
I strongly recommend that this is only used for the administrative purposes described above, it is unnecessary for production use.