Place 2 diamonds in the left and right middle slots of a crafting table
Place 1 matching block in the center slot
Place 1 item in the top-middle slot
Place 1 item in the bottom-middle slot
Use the correct template-specific ingredient for the template you want to duplicate
Crafting a smithing template duplicates it, not creates a new template type
Each craft produces 2 smithing templates
The recipe requires the original template plus the matching material for that template type