Thanks in advance

I have created a Fixed layout for pages, after that while creating the page how should i map the different fixed layout config to the Custom Page Type defined.
Right now when i select the custom page type, it is showing only the freestyle as Layout Type.
Can anyone clarify how the pagetype and layout type are mapped or related, so that i can use my fixed layout for the custom defined pageTypes.
Thanks,
Gowreeswaran C