Creating "Sub Web Pages" follows the exact same procedures as primary content pages, however you must indicate which content category you want your sub web page to appear under by selecting it from the available drop down menu each time you create a sub web page.  (*Note: if you fail to do this, the new sub web page will automatically show up under the first content category shown in this menu, so you can go look for it there, copy the content you've created, and try try again!)