Ordering from Iphoto

Can you order more than one print at a time or make a larger order with different items from Iphoto? I just ordered a photo book now have some pictures I want to order...but want to know if I can make one large order instead of having multiple orders each with its own shipping cost...or how I can merge them all into one order and pay one shipping fee instead of having multiple shipments and transactions to my credit card coming to me? New to Mac..and still figuring everything out...hope someone can help me..

Dorothy