--This script is Folder Action Script. It moves .torrent files to subfolder "Torrents" of the folder to which you attach this script.
--You need paste the text below to AppleScript Editor, and then save it to \Library\Scripts\Folder Action Scripts.

on adding folder items to this_folder after receiving added_items
    tell application "Finder"
        set foldName to the name of this_folder
        set destPath to foldName & "Torrents"
        try
            repeat with i from 1 to count of items in added_items
                if name extension of item i in added_items is "torrent" then
                    move (item i of added_items) as alias to folder destPath
                end if
            end repeat
        end try
    end tell
end adding folder items to