B2B Ordering Website with Excel Item Import, Photo Linking, and Customer Login

We need a custom B2B website built for wholesale for business ordering. Item master upload: ability to upload an Excel file containing our product list, including item numbers, descriptions, pricing, and other attributes. Photo linking: ability to upload product photos separately and link them to the correct items so each product displays its image automatically. Customer login: secure login system so registered business customers can log in and view pricing, place orders. New customer can assign their own log in and password for first time user. Ordering system: customers should be able to browse items, add to an order, and submit it. Order notifications: when a customer submits an order, an automatic email should be sent to both the customer and to us with the order details. Admin panel: ability for us to manage items, update pricing, add new customers, and view submitted orders. Nice to have: ability to export orders back into Excel format. Time line: ASAP, within 30 days Requirements: Please share examples of similar B2B or wholesale ordering websites you've built. Experience with Excel import and export logic is a must.