[Users] How to Modify Network with Hosted Engine

Hi, Now that I finally stepped through and have a working hosted engine setup (after opening numerous BZs).. How do I modify network configuration (eg. assign new VLANs to hosts), when I attempt to modify a network it gives the error: Error while executing action Setup Networks: Network is currently being used Is there a recommended way to set up these extra networks, or must all of these be not managed by the engine? Thanks, Andrew