You can easily create an order on behalf of your customer.
From your Wholester dashboard go to Customers and select your customer for whom you would like to create an order.
Then select New Order at the top of the customer profile page.
From here, you can then create an order by browsing through your products, or upload a CSV file that they have sent you.
The rest of the order placement and checkout process will proceed as normal.
For tips on how to place an order through Wholester, please see this article.