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In a stand up mixer attached with a bread hook, mix biga, remaining 2 cups flour, salt, and sugar on low speed for 1 minute. Increase speed to medium and mix for 5 minutes. . If the dough is not wet, sticky, and falling from the hook, add 2 tsp. water at a time (I have made this twice and haven’t had this problem!) Transfer to a bowl sprayed with Pam. Pull the dough up and over the top until it is smooth. Cover with plastic wrap and set in warm, draft free area for 1 ½ to 2 hours or until doubled in size.