commerce_product_discount.links.menu.yml

# Product discount menu items definition
entity.commerce_product_discount.collection:
  title: 'Product discount list'
  route_name: entity.commerce_product_discount.collection
  description: 'List Product discount entities'
  parent: system.admin_structure
  weight: 100

commerce_product_discount.admin.structure.settings:
  title: Product discount settings
  description: 'Configure Product discount entities'
  route_name: commerce_product_discount.settings
  parent: system.admin_structure