Go to SETTINGS > MANAGE NODES
Select the nodes that you want to remove from NCM, go MORE ACTIONS > REMOVE NODES FROM NCM.
The prompt will give you this message so be sure to backup your configs if you wish to keep them.
Are you sure you want to remove selected nodes from NCM?
After nodes are removed from NCM, all NCM Node history (such as backed up configs) will also be deleted.
There is also an option to add them to NCM again.
Was this what you were looking for?