Problem: I would like to copy a field from the parent post into the child post when submitting a child post form, but the save_post hook is not working.
Solution: Use the cred_submit_complete hook to automatically copy a field from the parent post into the child post when a child post form is submitted. Use the toolset_association_created post relationships API to get the field from the parent post when the relationship is established in wp-admin without forms.
