I saw this movie on TV in the mid 80's. It was about a boy and possibly a sibling too, who were separated from their north pole expedition... and santa sent a team to retrieve them and bring them to his workshop - which was like a real assembly factory. Once there santa explained that the extra toys they build are sent to retail stores... which explains why you can exchange santas toys at loval stores.

Does anyone know the name of this movie?
Thanks