You could do something 'quick and dirty' for QuoteWerks Desktop using custom scripting. Editing the Quantity / Price combinations would be tricky, but if they don't change too often, then that might be ok.
Creating something more elegant would take more time in the absence of an 'out of the box' solution.
If you're interested in talking more about either option, then feel free to reach out - steve(at)hilltopsit.co.uk
Tanya
Currently, QuoteWerks has a limit of 15 quantities you can enter with varying prices. Our use case needs 30 different quantities with varying price points. Would love to be able to add as many quantity and price points as needed, without limitation.