Hi Charles,
OK, I think what you are running into is that VIM (the Virt module that is inside of NPM/SAM) does not have a concept of a Hyper-V cluster. The VMAN integration does not currently create new objects in VIM, it only extends existing VIM constructs. The one major caveat to this is Datastores, which was the original focus of the VMAN 6.0 integration.