Multiple Images/ Slider with custom post [single.php] [closed]

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Closed 26 days ago.

I am looking for a approach to add multiple images option under the Feature image section in wordPress custom post type. I will integrate/implement these images on single.php file where I want to show the slider images.
I want to do it using Codex / coding approach, Please NO PLUGIN.
Any Idea/help will be appreciated.