While all customers, big or small, are different, your Corporate customers always have a few unique requirements.
You can upload simple print ready PDF files or editable file that customers wish to modify online. This way you can easily print both small and bulk orders. While uploading files, you can link up particular files with specific customers. Hence, whenever the customer logs in, he sees all the files that belong to his organization.
Of course, you can see the files of all your customers.