Seperate cresent roll dough into 8 rectangles. Beat cream cheese, margarine, and 1/4 cup milk in mixing bowl until light and fluffy. Stir in celery, onion, and chicken. Spread cream cheese mixture on each rectangle; roll to enclose filling. Place on non-stick baking sheet. Bake at 350 degrees for 18 to 20 minutes or until brown. Mix together soup and half soup can of milk and warm. Spoon soup over baked roll-ups.