Changing Category Assignment in Demantra

Hi

We are using demantra 7.3.0.1 and for considerable sometime using Sales Category Set as product category. However, we are planning to use a different category set for demantra in near future. Since ours is a running PROD environment and not 1st time implementation, we were looking for answers to following question.

1> Can we change category assignment in PROD environment without reloading the entire sales data again? How can we do that and what will be cons doing that?

2> If we want to map different segments of the new assigned category set to different hierarchy levels in demantra, what steps we need to perform?