Se eu entendi bem, tente o seguinte:
$Folders = Import-Csv "C:\drv\users.csv"
foreach ($folder in $Folders)
{
$Oldpath = $folder.oldpath
$newpath = $folder.newpath
$Personal = Get-ChildItem -Path $Folder.OldPath | where {$_.Name -eq "Personal"}
ForEach ($Person in $Personal)
{
$destination = $Folder.NewPath
Copy-Item -Path $Person -Destination $destination
}
}