Copy folders without files, files without folders, or everything using PowerShell

To copy everything in a folder hierarchie

Copy-Item $source $dest -Recurse -Force

To copy the hierarchie you can try:

$source = "C:\ProdData"
$dest = "C:\TestData"
Copy-Item $source $dest -Filter {PSIsContainer} -Recurse -Force

To flatten a file structure you can try:

$source = "C:\ProdData"
$dest = "C:\TestData"
New-Item $dest -type directory
Get-ChildItem $source -Recurse | `
    Where-Object { $_.PSIsContainer -eq $False } | `
    ForEach-Object {Copy-Item -Path $_.Fullname -Destination $dest -Force} 

Good luck!