You can print the number of labels that corresponds to the qty of the item in the shipment you are working on by going into SETTINGS > LIST and checking the box next to PRINT ONE LABEL PER EACH QUANTITY. 

Please NOTE: If you have the setting enabled to print the Fulfillment Center ID on your item labels turned on as well as the PRINT ONE LABEL PER EACH QTY please be careful when labeling your items to ensure the correct items go in the correct boxes.