I put take the net carb count and add the fiber count and list that in the carb section.
then I add the fiber in the fiber section because I deduct at the end of the day and I like to know how much fiber I eat.

Sometimes fitday will do that plain and sometimes they wont.

When they wont I take half the amount of sugar alcohols and I put it in the alcohol section.

That usually works just fine for me and doesnt mess up my counts. It also shows that I ate something 'bad' for me when I see the purple there.