Thank you for bringing this up here, Lakeri. There's a specific field in the Purchase Order (PO) form where you can find the Product/Service column, and I'll be glad to help you locate it.
Below the Category Details field, you'll find an Item Details section. Simply click on it, and all the columns will appear, including the Product/Service column.

If the field doesn't show, we can perform some basic troubleshooting steps. Let's start by logging into your account using private or incognito mode to see if it's a browser issue. This won't save any cache files that can cause unusual behavior with web-based programs.
Feel free to utilize the shortcut keys below:
- Google Chrome: press Ctrl + Shift + N
- Microsoft Edge: press Ctrl + Shift + N
- Safari: press Command + Shift +N
Then, access the form and check if you can see the Product/Service column. If this works, clear the cache of your regular browser to remove the accumulated data. If the issue persists, you can use another supported browser or device. This happens if the current one you're using has a temporary issue with the program.
I'll also add this article that outlines the procedures for adding an accepted purchase order to a vendor transaction: Add purchase orders to expenses, bills, or checks in QuickBooks Online.
Moreover, you can contact the QuickBooks Expert Live Assisted to further help you enhance the form you sent to your customers and vendors by making it detailed and professional-looking.
Click the Reply button and leave a comment below if you have additional questions about preparing your PO transactions so that we can further assist you. Take care always and stay safe!