Curtain is related to Stage. Stage is related to Construction. 
Trim is a type of Adjust. Proportion is a type of Adjust. Percentage is a type of Proportion. Percentage is related to Half. 
Curtain <--RelatedTo--> Stage <--RelatedTo--> Construction 
Trim --IsA--> Adjust <--IsA-- Proportion <--IsA-- Percentage <--RelatedTo--> Half 