Hi,
If your main objective is for the user to scan directly into one of the 300 folder then you will be in for a hell of a job to configure 200-300 templates like the suggested response above but this is the only way without using a optional solution that could do exactly what you want. There is a few software options available to you (like NSi AutoStore) if you want to spend a little bit on it.
Call your Xerox Sales Rep and ask for a Scan Solution for your need. It could make your life much easier.
Hope you Success!
K.