WooCommerce Wholesale Pricing lets you set wholesale prices for products in your store, where you can offer select buyers the ability to purchase items in bulk in your store at wholesale bulk prices. When installed and activated this plugin creates a "Wholesale Buyer" user role and adds a wholesale price field to all of your products - including variable products. And, when editing variations you can bulk edit wholesale prices, similar to how to your bulk edit regular prices in WooCommerce.