如何在条件内显示和更新“子页面”（使用primefaces）

I have a scenario to achieve but I don't know how to do it(I'am using primefaces) The scenario is: I have a selectOneMenu that contain options that the user can choose one of them, when the user choose an option ,a "form" or a "Sub-page" should appear below the selectOneMenu , the user should fill it. The "Sub-page" change according to the choosen optionI have a scenario to achieve but I don't know h