Open your Civilization config file
(\Documents and Settings\USERNAME\My Games\Sid Meier's Civilization 4\CivilizationIV.ini)
with Notepad and change the following line:


; Move along
CheatCode = 0


to


; Move along
CheatCode = chipotle


Once cheats have been enabled, while playing open up the console using
"~" (tilde) then type "help" for a list of cheat commands.


Cheat Code Example: Type Player.setGold 0 1000000 to add more gold.


You can also type Console.CreateDocumentation CommandList.txt
to create a list of cheat commands in a text file which
can be found in the game directory.



Debug Mode
After applying "CheatCode = chipotle" in the configuration file,
you can enter from console windows (open by using ~) the command
"game.toggledebugmode" (without quotemarks).

That will enable the cheat-dialog by pressing [SHIFT]+T.
From this dialog you can alter amount of Gold and level of technology for players in the game.