text: **4.5 Add/delete new nodes – user defined source categories**
  
  **4.5.1 Add new nodes**
  
  New nodes, for example, can be added to the navigation tree in order to add either a category, a fluorinated gas (F- 
  gas), a fuel, a livestock type, or a subdivision in the LULUCF sector. 
  
  User-defined items can be added for: 
  
   Categories indicated as “Other (please specify)” 
   
   User-defined fuels 
  
  LULUCF subdivision 