Rich Doughs

Where does Sugar fall into the bakers Percentage. I.e. making Challah  52% liquid, 2% Salt, 25% Fat. My Challah Recipe is the Following
6 Lbs of Bread Flour
6 Cups of Water - 52%
4 Egg Yolks - Part of Fat %
1 - 1/14 C of oil as needed - Part of Fat %
3 T of Salt - Salt %
2 C sugar - What category does this fall into? and is it part of the total liquid % - or Fat %

Recipe makes delicious Challah 4 - 6 loaves depending on Loaf sizes