I think I've figured out how to handle this!

I've decided to change how I've been using the "Product/Service" field on the invoice and use "Description" to identifying on that line of service what our internal ID Code is for that line of service.

It's going to take some work to clean up what we have in Product/Services but I think this is the ideal solution since QB does not support adding another field for each line of service.

Let me know your thoughts on this!