Place a custom post type under a custom menu items

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I’m trying to place a custom post type under the menus I made, Here is the screenshot of the menus. I want to add the custom post type together with that Menus. I used sandbox_theme_menu, but the custom post type is not appearing,

I tried adding this line in my register_post_type but still not appearing. Hmm any idea?

'show_in_menu' => 'edit.php?page=sandbox_theme_menu',

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