RSS AS Displayed

i want to display content from a certain page of one website to display as it is on another site. this content should then automatically update when new ones is listed in. I am working on a property website with sub sites for all different types of properties and services. my content displays perfectly but refuses as soon as i try to display it on one of my other sub sites.
so the main question is. how do i display the content exactly as it is on the other sub site