Input-output norms require imported components to match declared proportions for manufacture and export under FTP. Standard input-output norms list specific component types and permitted quantities or alternatives for manufacture of Current Transformers above 245 kV (outdoor type), and require determination of the proportion of inputs used in resultant products. Applicants must ensure imported goods are those actually used or required in the export product; this framework governs admissibility of input imports and compliance assessment against the listed component quantities and alternatives.