Justin said it all. Yes it's pretty simple. Here are the detailed notes I've setup for our Org...
Remove Cloned Volume
Once your VM is all restored and no longer required you want to be sure to remove the cloned volume.
Open vCenter server and browse to ‘Datastores and Datastore Clusters’.
Select the desired Datastore, and click ‘Enter SDRS Maintenance Mode’.
Right-Click the datastore and select ‘Unmount’. Run through the unmount wizard.
Right-Click the datastore and select ‘Delete’. Confirm the deletion.
Login to the Nimble Web Portal, select ‘Manage > Volumes’.
Select the volume you want to delete.
Select ‘Set Offline’.
Select ‘Delete’ and confirm the deletion.
That’s it. Your volume is all removed.