Reply To: [Assigned] Custom Post Type as child of standard WordPress Page

For example, structure:
Impact (WP page)
—Impact Stories (CPT)

You can create a CPT Impact Stories with Types, set it as a child CPT of a page CPT
Then when you edit a Impact Stories (CPT) post, you will find a field table where you can choose parent page, set it as Impact

parent/child relationships can be applied to CPT and wordpress build-in post types "post" & "page".

I am in GMT+8 area