Hafrashas Challah with Regular Dough

18. With regular dough, it is common to make a large batch of dough and then portion it out into pieces, each of which is used to form a loaf of bread or challah and then baked. The chiyuv hafrasha takes effect on the dough while it is whole [if it has the minimum shiur]. Thus, hafrasha is done while it is a whole batch of dough.