How can i display only custom channels on a map object ?

Hi.

I know i can create custom map objects, but i can't make it like i want it to be.

I want to create a map object like "Data Tables" -> "Channels of a Sensor" for an Ethernet Interface, but make it display only channels "Traffic in" and "Traffic out" in one column: "Last value (speed)". (actually the interface has a lot more channels like broadcast, multicast, errors, etc.)

Thanks for your help.