Setting Multiple Variables Automatically from a Drop Down List

Hello All,

I'm attempting to set the values of multiple properties based off a single drop down list selection, e.g.:

Selecting "DMZ"

sets values of:

VirtualMachine.Network0.NetworkProfileName

VirtualMachine.Network1.NetworkProfileName

to their appropriate settings.

I understand how using an XML filter list with a parent property of the first value gets me to the point where I can have other drop down boxes that let the user select only the DMZ networks, but I'd like to remove that step altogether and assign those values without prompting. Can someone point me in the right direction please?