Right click after adding the extras menu (not left as I sent before) and you will get the add unit GUI for the square you selected from.  (at any time during the game.)

GD Staff

To access the cheat menu type: CONTROL (press once), A, O, D, B, A, M, F From the menu you can access these cheats: ARMYINFO - Info on other races ALLSEEINGEYE - Unveils the whole map GETSMARTQUICK - Civilization Advance SETTLERSHO! - Creates a settler unit in each city SCALEIT - Production Increases MONEYANDPOWER - Suprisingly gives you money and power GETRICHQUICK - Gains you 1,000 coins MISSILECRISIS - Every city creates a nuclear missile NUKESTORMS - Global Warming AUTOMODE - Computer performs moves ARMEGEDDON - Nukes all cites