How to create subfolders in your Personal Folders folder.
Once your Personal Folders file is created, you can set up the subfolders in your filing system. You do this from the Navigation Pane:

To start, right-click
Personal Folders and click
New Folder.

In the
Name box, type a name for your subfolder.

Make sure
Personal Folders is selected as the location for the subfolder.
After you click OK, you'll see your new subfolder in the Navigation Pane under Personal Folders.