Turn dough out onto a floured work surface. Divide dough into two equal portions, about 28-30 ounces each.
Roll dough out to a rectangular shape, about 10 inches by 18 inches.
Spread the Nutella filling on the dough, leaving an inch border on the top side of the rectangle. Sprinkle 1 Tablespoon of cinnamon on top. Sprinkle 1/4 cup of walnuts evenly over filling.
Start with the long side, closest to you and working from left to right begin to roll dough up. You can tug and pull as you go which will tighten the roll and make more swirls. You should end at the side with the clean border. Pull that edge over and pinch the seam shut, creating a seal.
Using a piece of floss or baker's twine, slide it under the roll, bring the ends of the floss up, cross them over and tug to cut through the dough making a 2-inch-wide cinnamon roll. Continue to cut to get 9 equal sized rolls.
Place rolls on prepared baking sheet about 1-2 inches apart.
Repeat steps 2-6 for the second dough ball.
Cover with clean kitchen towel and let rise until doubled in size, about 45 minutes to 1 hour.