For more information about render nodes and connections, see About shading networks.
         
          To delete a node connection
         
         
            - Click the connection line(s) you want to delete (marquee-select or Shift-click to select more than one). 
               The lines are selected.
                
- Press Backspace (Windows, and Linux) or Delete (Mac OS X) to delete the connections. 
               The lines are deleted and the swatches in Hypershade update to show the changes.