Thanks for getting back to this thread, @Tom2400.

I'm glad that you can now finally entered the SKU number on your purchase order transaction. Currently, printing the purchase order with the SKU column is unavailable. 

In the meantime, I suggest adding the SKU information to the Description field so it will appear on the printed purchase order. 

Finding new ways to adapt to our customers’ needs is how QuickBooks gets even better. I'll take note of your request, and will update you once we received product enhancement about the availability of this option. 

Your feedback helps our Product Development team decide which feature will be implemented in the future update. 

For future reference, you may want to visit this article on how to personalize your forms, change the design, and add an info: Customize your invoices, estimates, and sales receipts in QuickBooks Online. 

Please know that you're always welcome to post if you have any other concerns. Have a good day!