add suffix to files in a folder

suffix.ps1

# Add suffix in place
Get-ChildItem -Recurse | Where-Object { !$_.PSIsContainer } | ForEach-Object {
    Rename-Item $_.FullName -NewName "$($_.BaseName)-$($_.Directory.Name)$($_.Extension)"
}

# Move to parent with suffix
Get-ChildItem -Recurse | Where-Object { !$_.PSIsContainer } | ForEach-Object {
    Move-Item $_.FullName -Destination "$($_.Directory.Parent.FullName)\$($_.BaseName)-$($_.Directory.Name)$($_.Extension)"
}

# Copy to parent with suffix
Get-ChildItem -Recurse | Where-Object { !$_.PSIsContainer } | ForEach-Object {
    Copy-Item $_.FullName -Destination "$($_.Directory.Parent.FullName)\$($_.BaseName)-$($_.Directory.Name)$($_.Extension)"
}