Open a savegame of a campaign game with a hex editor. If you save in first scene of germany's campaign (Almadrones) without doing anything, the line 000002d80 has an offset "f401". That's the prestige. Change is to whatever you like (DAD6 will do) and save it. Restart the game and load the savegame. You can refresh your prestige at any time. The location never changes. But: mass isnt everything - try to get experienced units all the same.