How do I change the background and have a character already in it?

INT. MANSION BEDROOM TEEN - NIGHT
@cut to zone 3 (there are only 3 zones in a background. There cannot be more than 3)
@/MOM spot 0.579 102 275 in zone 3 AND MOM faces right AND MOM is sleep_sit_neutral_loop

Ignore the “/” in MOM as I did that to avoid tagging anyone.