This is a basic WordPress question.
You can do that via phpmyadmin if you’re confortable with mysql or use a plugin. Search on plugin repo for CSV importer or similar keywords.
I thought this would be a buddy press question as the members relate to the plugin not users for our community website with custom profile fields.
Thanks Nick
Community members and wp users are the same thing and are stored in an unique DB table: xx_users which is the one you can bulk import/export.
I invite you to read through the Codex about members and what it does when it extend WP users.
