Yes, you can. First install it from your dvd, then copy the program directory to /steam/steamapps/common directory. Then uninstall it from your system. Now start installation in Steam and it will detect the existing the files. It will just download the missing files and you'll be good to go.
Note: If steam starts to download the entire game, it means that you need to rename your folder name in which your game files are present according to steam. Just look the folder name steam used for the game, then cancel the installation in Steam, rename the folder you copied and start installation again.
This might get a bit confusing but is well worth the little trouble rather than downloading the entire game.