Press Ctrl + K to enter the map editor and use one of the following codes:
Change year: Shift + F5
Create unit: Shift + F1
Discovery technology: Shift + F2
Edit energy credits: Shift + F4
Edit Faction diplomacy: Shift + F9
Full map: Y
Kill opponent: Shift + F6
Switch sides and reset view: Shift + F3
View FMV sequences: Shift + F8
View replay: Shift + F7