Don't be put off by the fact that you've got to edit a file for this one. It's not that difficult and it's definitely worth the effort.
Right. Load up the 'STORM.INI' file in an editor (Notepad will be fine) and add the codes below (or just the ones you want). This will actually add a new menu option during the game.
HERC BASE CHEAT CODES:
I'll Buy That For A Credit Receive one credit
Will work for credits 1000 credits
Mo money 10,000 credits
Too much wheat 100,000 credits
You may have already won 1,000,000 credits
CUC Mega credits
As Good as it Gets Max-O-Repair
You da man Max-O-Commander (Tech + Credits + Facilities)
Home is where the heart is Max-O-Facilities
Must have! Max-O-Chassis
He Who Dies With The Most Toys Gain all technologies
It was nice while it lasted Revert to normal technologies
BATTLE CHEAT CODES:
Tarsus Heal selected pilots
It's just a flesh wound Repair selected vehicle
Feel my wrath Restock selected vehicles
Go Go Power Ranger Reset selected units
Fly Away Get Mega turn-based move points
Vengeance is mine Get Mega turn-based action points
Did I break your concentration Touch of Death (one)