Open the Wholesale Order Form app from Shopify’s admin.
Then, click “Update to new order form” from the app’s Dashboard. You're all set!
If you’d like to see how the order form will look on your store first, click on the ‘See preview’ button. Settings from Manage Products will continue to work. However, customization settings are reset because the new order form was built from scratch. Please make sure you adjust your settings as needed after updating.