Delete interfaces, devices, interface groups and network views
On the Definitions > Interface Groups page, delete items as follows.
Network Views section - Right-click any view or group in this section and choose Delete from the right-click menu. This deletes the view and all its members. Deleting the members of one network view or interface group does not affect the membership of any other group of view outside of it.
Members of View/Group section - Select the check box on the line for any interfaces, devices or interface groups to be deleted. Then click Delete Selected.