Parade is related to Main. Main is related to Door. Door is related to Step. Step is related to Platform. 
Partial is related to Month. Month is related to Section. Insert is a type of Section. 
Parade <--RelatedTo--> Main <--RelatedTo--> Door <--RelatedTo--> Step <--RelatedTo--> Platform 
Partial <--RelatedTo--> Month <--RelatedTo--> Section <--IsA-- Insert 