Submit a provisioning request for a VM in the NSX routed network, as described in Provisioning and De-provisioning VMs with Registration in NIOS.
Now if you go to the Requests tab in vRA, you can see the details of the NSX machines provisioning execution.
In vRealize Orchestrator, you can notice that an instance of the Create IP Ranges workflow is executed.
In NIOS, a new on-demand network is created in the specified network container. First available IP address in the network is assigned to the router. The IP address of the corresponding VM is allocated in the on-demand created network.
In vSphere Client, you can check that the new VM is spun.