Hi 
assuming this is your csv file
"name","ip","netmask","gateway","dns","networkName"
"TESTSRV1","10.244.186.136","255.255.255.0","10.244.186.1","10.244.37.25;10.244.37.26","VLAN186_QA"
you have one problem. You can't save any arrays into a csv and make powershell recognize them natively.
Instead, use a custom delimiter (not the same as csv uses!) and split them - at import - into an array. Look at the semicolon between the two dns servers.
$newVmList=Import-Csvtest.csv | Select-Object-Property"name", "ip", "netmask", "gateway", @{Name = "dns"; Expression = {$_.dns -split";"} }, "networkName"
The resulting object looks like this
name : TESTSRV1
ip : 10.244.186.136
netmask : 255.255.255.0
gateway : 10.244.186.1
dns : {10.244.37.25, 10.244.37.26} <-- Array
networkName: VLAN186_QA
Regards
Emanuel