First of all it is used when creating or editing any CMS page from admin interface. So to add new template we need to change in app/code/core/Mage/Page/etc/config.xml
Create new template file in following directory or and name it for example top.phtml
app/design/frontend/default/default/template/page
Now in config.xml add below code under the <layouts> tag
<top> //start layout
<label>Top</label> // layout name
<template>page/top.phtml</template> // template file
</top> // end layout
That's it. You can now add this template to any CMS.
Notes: when you upgrade magento you need to take backup of this config.xml otherwise your change will not effect after upgrade.
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