I am not sure what you mean by migration code. If you have content - such as HTML/images/videos in another CMS system, you need to build your AEM site using AEM templates and components, Then you need to organize your site into Header, body, nav and footer, etc. You can build the AEM site as shown here: Scott's Digital Community: Creating your First Adobe Experience Manager 6.3 website Notice how the pages are organized, HTML is copied into components - like the footer component, etc.