You can organize the portfolio by using directories and subdirectories. To create a subdirectory make sure that you are in the correct directory first of all (See Changing Directory ). The current directory you are in is shown above the list of files. It is a link having the text "portfolio/".
Once you are in the correct directory:
Creating a subdirectory does not put you inside the directory. If you wish to enter the directory you must click the directory name you have just created.