Print multiple copies of a document. Create and print envelopes. Create and print labels. The Open dialog box can manage many tasks involved in managing files and folders. And the files that come after the folders.
Folders can have subfolders and files.
You may create as many levels of folders and subfolders as you need. Maryann's Folder contains all of my folders and files that I use for teaching and for personal business such as my resume, reference letters, etc. When they save files, they create subfolders in their main folder to store their documents. It's as though each of us has our own 'drawer' in the computer. When you click on the Create New Folder button in the Open dialog box toolbar, a small window appears in which you type the name of your new folder.