PowerShell Workflow script for Azure Automation to remove a bulk of VMs. (For production use you should add some error handling.)

Stop-ITCampManagementVMs.ps1

workflow Stop-ITCampManagementVMs
{
    Param (
        # Name of the target Azure subscription.
        [Parameter(Mandatory=$True)]
        [String]$SubscriptionName = "MSFT IT Camp Stage",
        [Parameter(Mandatory=$False)]
        [String]$NamePrefix = "itc0203"
    )

    # Get the Azure connection asset that is stored in the Automation service based on the name that was passed into the runbook 
    $AzureConn = Get-AutomationConnection -Name $SubscriptionName
    # Get the Azure management certificate that is used to connect to this subscription
    $Certificate = Get-AutomationCertificate -Name $AzureConn.AutomationCertificateName
    # Set the Azure subscription configuration
    Set-AzureSubscription -SubscriptionName $SubscriptionName -SubscriptionId $AzureConn.SubscriptionID -Certificate $Certificate
    # Select the Azure subscription.
    Select-AzureSubscription -SubscriptionName $SubscriptionName
   
    $matchingCloudServices = Get-AzureService | Where-Object -Property ServiceName -ilike "$NamePrefix*"
   
    foreach -Parallel ($service in $matchingCloudServices) {
        Write-Warning "Removing $($service.ServiceName)"
        Remove-AzureService -ServiceName $service.ServiceName -DeleteAll -Force
    }
    
    $matchingStorageAccounts = Get-AzureStorageAccount | Where-Object -Property StorageAccountName -ilike "$NamePrefix*"
    
    foreach -Parallel ($storage in $matchingStorageAccounts) {
        Write-Warning "Removing $($storage.StorageAccountName)"
        Remove-AzureStorageAccount -StorageAccountName $storage.StorageAccountName
    }
}