The copy from field to field statement copies matching components from one composite to another. Non-matching components are not affected.
copy from field source_field to field destination_field
• source_field – The name of the composite you want to copy components from.
• destination_field – The name of the composite you want to copy components to.
Components are matched based on their field IDs. This means a specific component in the source composite and a specific component in the destination composite must be based on the same global field resource in order to match.