Make separate text boxes for separate WordPress Custom Fields

You need to create metaboxes for the custom Post meta data for which you want to add UI. Refer to add_meta_box() for implementation documentation.

EDIT

Based on your comment, it would appear that, in order to change an existing Post custom metabox, you need to find the callback function referenced by add_meta_box(). Can you post some relevant code – primarily, the add_meta_box() calls themselves?

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