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WP rabbits has a new plugin for this

You could do that with a plugin or by copying the database or importing/exporting, i found this plugin https://wordpress.org/plugins/ns-cloner-site-copier/ but i am not sure if it does the job.

There is a more safe way to add custom fields.

1.add this in your functions.php




function childtheme_add_importer_args_filter( $args ) {
// add args
...