You cannot transform Tommy Vercetti into Spider-Man in Grand Theft Auto: Vice City using a cheat code. The game lacks any built-in mechanism for swapping character models; Tommy's appearance and abilities are hard-coded.
Warning: Modding carries risks, including game instability and file corruption. Always back up your game files before installing any modifications.
In short, a simple cheat code cannot make you Spider-Man in Vice City. If you want that experience, you would need to look toward PC mods or play a dedicated Spider-Man game.