Not all of the ready-made eCommerce platforms have in their list the functionalities that will suit your B2B industry. To provide a personalized customer experience for your B2B sector, you might want to consider developing your own custom eCommerce website. 

Menu Item Extras makes the Menu Link Content entity fully fieldable. The module fixes core issues and provides a couple features, like Demo Module and View mode per menu item, which makes developers' lives easier. It allows us to use all fields types for menus as for the normal Drupal 8 entity. Each menu is a bundle for the Menu Link Content.