If you are uploading your new document via the print driver, you can get to the Print New Document page after logging on to the website. In the right sidebar is the "Is this part of an existing document" section. In the drop-down menu is a list of documents that are listed in the My Documents page. Select the document where your new document will be added . Click the Add button and your new document will be added to the end of your existing document. You can then choose your document finishing options.