How do I edit IP assignemnts in Network Profiles in vRA

A VM have been provisioned using a VLAN defined in a Network Profile. An IP has then been allocated to the VM from the network profile. All good but VM has then been manually edited to have a new IP and VLAN assigned replacing the original vRA defined IP and VLAN. Does anyone know how I can remove the old IP from the vRA network profile ?

Going forward we are developing a vRO workflow to allow the users to run a job to alter the VM custom properties to then alter the VM IP in the profile.

Thanks

Prestonville