I can share some information about back order in QuickBooks Desktop,  marathonwest.

Currently. the option to print Ordered, Shipped and Backorder quantity on the invoice is unavailable. I can see how this feature would be beneficial to your business. I’ll take note of this and let our engineering team know. That way, they might consider adding this in future updates. I'd also recommend sharing your ideas with our Product Development Team. They'll put your suggestions into consideration for future product updates. You can submit it by clicking the Help menu at the top and selecting Send Feedback Online (Product Suggestion).

I'm adding this article for more details: Use and customize form templates.

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