ProgressBarDemo.ps1

$items = 1..3
$i = 1
foreach ($item in $items){
    write-progress -id 1 -activity "Parent Progress Bar" -status "Iteration $item" -percentComplete ($i++ / $items.count * 100)
    $j = 1
    foreach ($child in $items){
        write-progress -parentId 1 -activity "Child Progress Bar" -status "Iteration $item`.$child" -percentComplete ($j++ / $items.count * 100)
        Start-sleep 1
    }
}