Multiple NPM instances consolidation

Hi,

Currently we have multiple environments, which require that we have separate management applications in each environment.  Many of these management applications have and instance (or more) in each environment... currently we have 5 instances of NPM running.  

We are consolidating these management applications.

I will be moving our biggest database from one server to another, but I'm unsure as to the best way to move the data from the smaller databases into the bigger one to get down to 1 or 2 databases, and 1 or 2 instances of NPM.

Is there a way to mass export nodes and statistical data to import it into another database, or merge the smaller databases into the bigger one?

Thanks!