Currently, no. Labels are based on the 'header' of the document, not 'details', meaning that you can only assign a total number of labels to the entire order (or invoice). And to answer your earlier question, there is only one specification designer program (not one for labels and another for invoices), and the specification field list does not automatically hide 'unavailable' fields. This is why you can see Item Number and Description in the field list, but they are not actually used for printing labels.

There is currently no way to specify that item XXX will be packed in box #A of N. This is what would be necessary in order to be able to print item detail information onto labels; a new detail field 'Box #' or 'Label #' so that the program would know what box the item belongs to. Otherwise how would the program know which items were packed in which boxes?

And further, if enough quantity of an item is shipped to require multiple boxes, there would have to be a way of specifying multiple labels to a single detail - or if not, adding a separate order detail for each box (ie 3 lines with qty shipped 5 each, if only 5 items fit in a box).

I'll forward the suggestion to development for adding a 'label number' field to the Detail screen. It would take some serious programming to 'calculate' the total labels for a document and to print out the list of items for each label.