Getting a subpage listing
To get a list of all the subpages for a particular page, click on Special pages in the toolbox. Then click on All pages with prefix under "Lists of pages". Then select the namespace the page is in (from the pulldown menu), enter the pagename in the inbox with the caption Display pages with prefix, and press Show. If the page's name was "pagename", then all the subpages would start with "pagename/".
Try it now: Special:PrefixIndex