It would be very helpful to get a mergefield for the total number of boxes for a sales order. There is already a mergefield for the box number. If there were a mergefield for the total number of boxes, then I could create labels to attach to the boxes which would show: Box 1 of 3, Box 2 of 3, Box 3 of 3. I suppose I would maybe need another field to designate how many labels to print for the corresponding number of boxes.
In this way I can ensure that customers are delivered their complete order.