I use Fitday PC, which is alot easier. I just create a new custom for every major polyol...with the following equations:

CHOtotal = (GIpolyol / 60) + CHOfiber
CHOfiber = (4 - kcal per gram) / 4
Alcohol Calories = kcal per gram - ((CHOtotal - CHOfiber) x 4)

Fitday PC allows you to enter the Alcohol Calories, which just lets me put any remaining Calories in as Alcohol. Here's the Numbers I came up with: