Start a new game with a character, earn some money, gems, armor, or whatever. Then save, start another new game with a different character and save the second character in a different slot. Load the save with the character you want to play as, and then import the second character as Player 2. Have Player 1 drop everything you want to duplicate. Player 2 picks it up. Then remove Player 1 and save with Player 2 in the second save slot. Reload Player 1's save. You still have all the items. Import player 2 from save 2, have Player 2 drop all the items picked up the first time. Player 1 picks them up, then remove Player 2 and re- import Player 2 as often as you want.