How do I bet 2 horses to provide a pre-determined profit, should either win?

umm you could play a 2 dollar exacta playing your two facorates or you could play my favorate across the board so it cost 6 dollars and you can win even if your horse comes 1 ,2,or ,3 i play or you could play partial wheel like say you like the 5 and 6 you could play partial wheel 5 over the 1,2,6 first and second so as long as the horse on top comes first or second and two of your other three come in you win the trifecta ammount i believe it cost 12 dollars for a dollar trifetca and you get half of the winnings but if you bet a 2 dollar trifecta it cost 24 dollars and you get the full winnings