Choose the B2BKing customer group to use when a customer's group has no match in B2BKing Customer Group Map.
The list shows the B2BKing customer groups in your WooCommerce.
Good to know
If the list is empty, check that WooCommerce is connected. An empty list almost always means the connection, not the setting.
If a value is missing, create it in B2BKing first, then click Clear Cache on the settings page so the list is refreshed.