Betfair Betting Bot - Gruss Software

I need an excel? spreadsheet that I can attach to the betting assistant (Gruss Software), that will place back and lay bets on a particular horse (which I have selected at the start of the day). I am basically trying to trade on the steamers. I usually have one horse in each race. So, I need a spreadsheet that will place a back bet at say 60mins before the off on a particular horse (within a certain odds range), then I would like it to place another bet 5 mins before the odd, and then green up (or red up) depending on which way the odds have gone. I hope that this is making sense? I have been using a betting bot called the Grey Horse Bot, which I am sure you are aware of. Unfortunantly it is causing me some problems, as it does not green up properly, and sometimes it will only place the first bet at 60mins, and then fire in another bet with 5 mins to go, but if the market moves and it does get matched I lose my whole stake. Can the spread sheet have a fail safe that if the bet doesn't get match it will fire in another one until it does? Rather like 'Kill or Fill'. I hope that I have explained it. If you are interested, and it is possible to do this sort of thing, I can give you a more detailed run down of what I need.