bm-1.0.x-dev/bm.links.menu.yml

entity.bm_type.collection:
  title: 'Booking types'
  description: 'Manage Booking Manager type.'
  parent: system.admin_structure
  route_name: entity.bm_type.collection

entity.bm.collection:
  title: 'Booking Lists'
  description: 'List of Bookings.'
  route_name: entity.bm.collection
  parent: system.admin_content

bm.settings_form:
  title: 'Booking Generator'
  description: 'Generate Dates and Places.'
  parent: system.admin_content
  route_name: bm_generator.settings_form