Yes! Go to the Goals tab, tap the "+" button in the top-right corner, then select "Net Carbs" from the list of goal types. Then, you'll be able to view your daily net carb intake from the History tab above your food log. Go to the Goals tab to view your net carbohydrate intake over longer periods of time.
In FoodNoms, net carbs are calculated by subtracting fiber and sugar alcohols from carbohydrates.