Hi there,
The quick way for displaying all the post items for a custom type is to use some of the bundled plugins with Pro. For example the grid plugin where you can filter the output using the options available and specify which custom post type they should come from. It will then generate a shortcode which you can use on a page or use the specific element in Cornerstone.
Another options that would take some custom customization is to code your own template files. Kindly follow the suggestion here. Please note that this would fall beyond the scope of our support as this requires some customization. As such, you will need to investigate this particular issue on your own or seek help from a developer should you not feel comfortable making these changes yourself.