arch-8.x-1.x-dev/modules/price/arch_price.links.action.yml

entity.price_type.add_form:
  route_name: entity.price_type.add_form
  title: 'Add price type'
  title_context: arch_price_type
  appears_on:
    - entity.price_type.collection

entity.vat_category.add_form:
  route_name: entity.vat_category.add_form
  title: 'Add VAT category'
  title_context: arch_vat_category
  appears_on:
  - entity.vat_category.collection