Helpful is related to Useful. Useful is related to Facility. 
Section is part of Whole. Section is a type of Concept. Division is a type of Concept. Division is a type of Separation. 
Helpful <--RelatedTo--> Useful <--RelatedTo--> Facility 
Whole <--PartOf-- Section --IsA--> Concept <--IsA-- Division --IsA--> Separation 