Microwave 1 cup water until hot (about 115°); stir in 1/4 cup of shortening until melted. Add to yeast mixture. Beat at low speed, gradually adding 4 cups flour, until smooth. Gradually add 2 1⁄2 to 3 cups more flour, beating until a sticky dough forms. Transfer to a lightly greased bowl; turn to grease top. Cover and chill 4 to 24 hours.