Modify excel GAMBLING dutching calculator

PLEASE DO NOT BID UNLESS YOU KNOW WHAT A DUTCHING CALCULATOR IS FOR GAMBLING/BETFAIR! I want a dutching calculator that will calculator stakes for each horse.. but to be able to win more on 1 horse over the rest. I have found a calculator on the web, where someone has managed to achieve this but in terms of weight against other horse. Instead of using weight I want to be able to use profit. So for example: Horse 1 - ODDS [5.0] - Stake £5 - PROFIT £8.95 Horse 2 - ODDS [10.0] - Stake 2.50 - PROFIT £8.95 Horse 3 - ODDS [7] - Stake £3.55 - PROFIT £8.80 Horse 4 - ODDS [6] - Stake £5 - PROFIT £13.95 AS you can see 1 horse has more profit. But I want to be able to type the profit into the calculator, and the calculator calculates the stakes.