How do I export a single invoice as CSV (or Excel), showing each line item? (The invoice itself cannot not be Copied and Pasted into a spreadsheet)

Utilize an exporter tool

https://transactionpro.grsm.io/qbo

Hi there, @fhgfj.

I can see how exporting a single invoice showing each line of items would be helpful. Rest assured that I'll relay this message to our team in concern here on my end and add your vote for this one.
 
You can also share your thoughts and ideas through your account. Our product development team reviews all the feedback we receive to ensure we’re meeting the needs of our customers. 

Here's how:

1. Select the Gear icon at the top, then Feedback.
   
2. Enter your comments or product suggestions then select Next.
3. You'll be provided a list of suggested Help articles related to your comment. You can read through them or select Skip and send message.
4. From the drop-down, choose the appropriate category, then select Send message.

In the meantime, you may consider using an exporter tool as suggested by Fiat Lux - ASIA. You can visit our Intuit App Center to look for an app that can help you with the process.

You can follow these steps:

1. On the left panel, click Apps.
2. Go to the Find Apps tab.
3. Type a keyword in the search bar.

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For more information about importing or exporting data, you can check out these articles: 

•    Export reports, lists, and more
•    Common questions about importing data to QBO

Stay in touch if you have any other questions or concerns. I’ll be right here to answer them for you. Enjoy the rest of the day.