This script prepends the parent folder name and " - " to all the children folders. It them moves the children folders to the same level as the parent folder.

Prepend and Move.applescript

tell application "Finder"
  set thePath to (path to desktop folder as text)
	set clientFolders to get name of folders of folder thePath
	repeat with theFolder in clientFolders
		if the theFolder starts with "_" then exit repeat
		set matterFolders to get folders of folder (thePath & theFolder as text)
		repeat with aFolder in matterFolders
			set clientName to theFolder as text
			set the name of aFolder to theFolder & " - " & the name of aFolder
		end repeat
		set matterFolders to get folders of folder (thePath & theFolder as text)
		repeat with aFolder in matterFolders
			move aFolder to thePath
		end repeat
	end repeat
end tell