To further customize the enumerators for your system configuration, you can create a /etc/host_cfg/$HOSTNAME/system/enum directory.
If this directory structure exists, the rc.devices script tells the enumerators to read configuration files from it instead of from /etc/system/enum.
An easy way to set up the directory is to copy the /etc/system/enum directory (including all its subdirectories) to your /etc/host_cfg/$HOSTNAME/system directory and then start customizing.