Starting in Milan to Zermatt 2 days then Murren area 4 days then to Paris. Which train pass would be most efficient
Get a Half fare card it will give you 50% off.
https://www.sbb.ch/en/tickets-offers/tickets/guests-abroad/swiss-halffare-card.html
Use this site to book https://www.sbb.ch/en book your trips Milan to Zermatt and Switzerland to Paris well in advance to save.