To print or save PDF of a Purchase Order, go into the Purchase Order, click 'Print' or 'Preview'.

QuickBooks Commerce will automatically generate a PDF version of your Purchase Order which will include the Company Logo and Primary Address entered during setup.
With the new document viewer, your Purchase Order preview looks like this:
You can choose to use the New document viewer, or revert to the old layout by clicking on 'here' at the top of the page.
If you wish to print or download your Purchase order, click on the 'Print' or 'Download' button respectively.
Your Purchase Order in PDF is ready.