Yes, follow the soup instructions up until adding the tortellini. After shredding the chicken and returning it to the soup mixture, let the soup cool entirely without adding the tortellini. Then place the soup in an airtight container or freezer bag in the freezer. When ready to use the soup, put it in the fridge overnight to thaw. Then set it in the crockpot and add the tortellini to cook until warmed through. Stir in the cheddar cheese just before serving.