There is some possible interest in a tool that will transfer a subset of Fogbugz cases from one account to another. (for example a company sells one of its products to another company and the appropriate cases should be transferred as well.)
Right now there is no good way to do that, based on Fog Creek’s feedback.
There are at least two requests for this feature that I am aware of:
It is likely that once-off tools/scripts have been written to do a clone/copy to/from FogBugz databases but it might be nice to provide a tool to do this. The .NET wrapper for FogBugz API is a good place to start. It is certainly worth investigating.