calculations in betangel for dutching

[m2spunting]

So i backed a horse on my betfair a couple of days before the race.
on the day of the race I went to do some more bets on betangel using dutching. So the problem i found when backing other horses the betangel program doesn't take into account the bets that have already been played.
Is there a way so it does in settings or an easy way to figure it out?
cheers