Originally Posted by
swag
I don't buy CDW myself, but I don't think it offers a discount if purchased in advance, does it? So my suggestion to plentyofroomattheback would be to reserve without it, submit the reservation to AutoSlash for tracking, then go back to add the CDW (or just wait until you check in to pick up the car).
Based on the OP's program designation of "Qantas," I'm assuming he/she's based in/near Australia. Rentals booked through European/Australian/other overseas sites are often all-inclusive, so I'm guessing that's what he/she's referring to.
As for including the cost of any prepurchased CDW, those are usually only available from third-party OTAs like Orbitz, Expedia, etc., and AFAIK, they are itemized separately from the cost of the reservation. (Note that these are separate insurance products sold by companies like Allianz and TravelGuard--you're not actually prepaying for the CDW with the rental company itself.) So it should be fairly easy to "unbundle" the cost of CDW insurance if you've bought it from a third-party site, but I don't think that's what the OP is referring to.