No. Shipping labels can only be used once. If you print a label multiple times and attempt to use it on more than one package, it will likely be rejected by USPS and sent back to you, or lost in transit.
If you need to divide up an order between multiple packages or need to re-send a package that was returned to sender, please reach out to PangoBooks support, and we'll be happy to help.
For more general info on shipping on Pango, see this article.