We recently negotiated a rate for UPS 2 day flat rate shipping. This rate works great for a large number of our products. This is NOT a shipping service that is offered through Amazon shipping/Veeqo. If we add our UPS shipping account to Amazon, so that we can take advantage of this 2 day flat rate shipping rate, will we lose access to our current Amazon UPS rates? Or, will the system allow for us to see Amazon rates and our own rates?