Hello Waungiesie72
It depends on the ticket type: regular point-to-point tickets or Saver Day Passes are good for any connection on the ticket’s date of validity.
Supersaver tickets are only valid for the connection as chosen during purchase. They are lost if you miss the connection. We therefore do not recommend purchasing Supersaver tickets when arriving by air as a flight delay may be possible.
Check for Saver Day Passes; their price increases the nearer the travel date and the higher the demand. A regular point-to-point ticket will cost you CHF 106, full fare, one way.
https://www.sbb.ch/en/tickets-offers/tickets/day-passes/saver-day-pass.html
Kind regards,
Roland