Hi mun-pongc,
Are we talking about in WP admin side, the "field table" when you edit a parent post with Types?
If it is, please try this:
Goto WP admin side, Types-> Custom Post Types and Taxonomies, edit the parent post type,
in section "Post Relationship", click "Edit" button after the "Children", click "(Edit fields)" after the child post type, there you can customize "Select child fields to be displayed"