Current accounting setup for US - Axapta 3.0

Hello all

We are a Norwegian based Microsoft partner who has a client running Axapta 3.0. They have recently taken over a small US company and want the US company to use the system. They are suppose to use an existing setup/Layer, but we need to modify all the local stuff. Anybody have a clue on how to get hold of this?

Thx in advance