Network zones

Good %GreetingTime% %UserName%,

Does anyone have good advice for a noob on how to setup the servers so you can see what network zone they belong to?

As an example two zones could be DMZ, and Corporate.

I want to only see servers in the DMZ.

I notice that for any locations that I have setup that are linked to a subnet, that when I open the 'Resource Manager associations', that I can see the corresponding network zone. However, for the servers that have no linked subnets to locations, I can't see their corresponding zones.

Thanks in advance.