Adding networks to vApps in vCloud Director

Has anyone been down this road? I need to script the adding and deleting of networks in the vApp.

Is it possible in PowerCLI or the ExtensionData to:

- Delete a network from a vApp

- Add a "Organization Network" to a vApp

- Add a "VM Network" to a vApp Route the "VM Network" to "Organization" with Natting on and firewall off.

Thanks