Resize VMs in a Resource Group

Resize ARM VM.ps1

Login-AzureRmAccount

$ResourceGroupName = "INFLAB"
$NewSize = "Basic_A3"

$vms = Find-AzureRmResource -ResourceGroupName $ResourceGroupName -ResourceType Microsoft.Compute/virtualMachines

foreach ($vm in $vms)
{
    $newvm = Get-AzureRMVM -ResourceGroupName $ResourceGroupName -name $vm.Name
    $newvm.HardwareProfile.VmSize = $NewSize
    Update-AzureRMVM -ResourceGroupName $ResourceGroupName -VM $newvm
}