If the quantity/package is updated under the Sales tab in the Update Part procedure, or if the Quantity/location is updated under the Manufacturing tab in the same procedure (the quantity/location overrides the quantity/package), the system calculates how many transport labels to be printed based on the reported quantity. You can also manually enter a quantity in the Labels field in this procedure. If you have saved the row, you can still modify this field if you, for example, want to re-print the transport label.
Also see information about the Quantity/package (Qty/pkge) and Group fields.