create-azure-vnet-powershell

$stName = "<chosen storage account name>"
$locName = "<chosen Azure location name>"
$rgName = "TestRG"
New-AzureRmResourceGroup -Name $rgName -Location $locName
$storageAcc = New-AzureRmStorageAccount -ResourceGroupName $rgName -Name $stName 
-Type "Standard_GRS" -Location $locName
$singleSubnet = New-AzureRmVirtualNetworkSubnetConfig -Name singleSubnet 
-AddressPrefix 10.0.0.0/24
$vnet = New-AzureRmVirtualNetwork -Name TestNet -ResourceGroupName $rgName -Location $locName -	AddressPrefix 10.0.0.0/16 -Subnet $singleSubnet
$pip = New-AzureRmPublicIpAddress -Name TestPIP -ResourceGroupName $rgName -Location $locName -	AllocationMethod Dynamic
$nic = New-AzureRmNetworkInterface -Name TestNIC -ResourceGroupName $rgName -Location $locName -	SubnetId $vnet.Subnets[0].Id -PublicIpAddressId $pip.Id
$cred = Get-Credential -Message "Type the name and password of the local administrator account."
$vm = New-AzureRmVMConfig -VMName WindowsVM -VMSize "Standard_A1"
$vm = Set-AzureRmVMOperatingSystem -VM $vm -Windows -ComputerName MyWindowsVM 
-Credential $cred -ProvisionVMAgent -EnableAutoUpdate
$vm = Set-AzureRmVMSourceImage -VM $vm -PublisherName MicrosoftWindowsServer -Offer WindowsServer 	-Skus 2012-R2-Datacenter -Version "latest"
$vm = Add-AzureRmVMNetworkInterface -VM $vm -Id $nic.Id
$osDiskUri = $storageAcc.PrimaryEndpoints.Blob.ToString() + "vhds/WindowsVMosDisk.vhd"
$vm = Set-AzureRmVMOSDisk -VM $vm -Name "windowsvmosdisk" -VhdUri $osDiskUri 
-CreateOption fromImage
New-AzureRmVM -ResourceGroupName $rgName -Location $locName -VM $vm

In azure powershell first created subnet and then v-net (added subnet to it) - subnet didn't asks for ARM
in azure cli its different, first v-net then used v-net name while creating the subnets.