I understand the importance of including SKUs column when printing Purchase Orders (PO) in QuickBooks Online, @andy149. I'm here to provide you with some insights and a workaround in achieving that.

You can add the SKU field to your PO by following the steps below:

In the Gear icon, click Account and Settings.

1. Go to the Sales tab, then go to the Products and Services section.
2. Mark the box to Show SKU column.
3. Click Save, then Done.

Next, let's enable the SKU option on the Standard template. Here's how: 

1. In the Gear icon, choose Custom Form Styles.
2. Search the Standard or Master template, then click Edit.
3. Go to the Content tab, then click the middle part of the template.
4. Click the SKU option.
5. Hit Done. 

This will now show the SKU on your purchase order. However, please note that you can only add one SKU per PO.

In the meantime, I would like to share another workaround to help you print and have SKUs added per product/service on your PO.

Here's how:

1. On the Purchase Order window, add the SKU numbers under the Description column.
2. Tap on the Print button to print the transaction.
3. The SKUs are added under the Description section.

I've included these screenshots for your visual reference; however, the names listed are merely examples and are not actual.

We may not be able to provide a  specific timeline for when this SKU column per product/service option will  become available. However, we want you to know that we have received your feedback, and our Product Developers are working hard to find ways to improve our products and services based on customer suggestions. Please rest assured that as soon as this feature is ready, we will update our website to let you know.

Nevertheless, you can see what's new with estimates and invoices and customize your sales forms in QuickBooks Online.

To make sure issue is fixed for you, I would like to know how you get on after attempting the steps. Kindly respond to this post, and I will get in touch with you.