How should sugar replacers (polyols) be calculated in exchange lists for meal planning?

Experts in diabetes management advise that if less than 10 grams of sugar replacers (polyols) is consumed, that serving is considered a "free food". Above 10 grams, subtract half of the grams of sugar replacers (polyols) from the grams of total carbohydrates and then calculate the exchange.

Source: Calorie Control Council