Once custom device properties are defined in the Red Hat Enterprise Virtualization Manager, you can begin setting them on virtual network interface cards. Custom properties are set from the VM Interface Profile window of the Profiles tab in the details pane for networks in the Administration Portal.

The VM Interface Profile window provides a facility for you to select from the list of defined custom properties. Once you select a custom property key, an additional field will display allowing you to enter a value for that key. Add additional key/value pairs by clicking the + button and remove them by clicking the - button.