Using the custom post type you will notice the page where you edit or add a new post only has the bare minimum of panels. But what happens if I want to add a specific excerpt???
Easy 🙂 use the following code and add it to your functions file.
add_post_type_support( '[your custom post type name', 'excerpt' );
Im not quite sure what the other panels are called. When I find out I will reply to this post with a list.