commerce_shipping.links.menu.yml

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

shipment.admin.structure.settings:
  title: Shipment settings
  description: 'Configure Shipment entities'
  route_name: commerce_shipment.settings
  parent: system.admin_structure

# Shipment item menu items definition
shipment_item.admin.structure.settings:
  title: Shipment item settings
  description: 'Configure Shipment item entities'
  route_name: commerce_shipment_item.settings
  parent: system.admin_structure