Hi there, TCDK.

I'd like to share ideas regarding SKU in QuickBooks Online. For now, asking about the SKU showing on the printed purchase order is unavailable in QuickBooks Online. 

I would like you to know that your voice matters to us. Most of our product enhancements are coming from our customer's feedback. This time will take this as a product suggestion.

I encourage you to visit our Blog site to be updated with the latest QuickBooks news and improvements of the product. 

You can always come back here if you have any other concerns. Take care!