Hello SueW03
Your question is not specific enough to have a clear answer for you. Generally speaking, regular point-to-point tickets or day passes are valid for any connection on the day of travel.
Supersaver tickets and Saver Day Passes, however, come with restrictions, you can find them listed here:
https://sbb-tickets.cc/en/help-and-contact/products-services/tickets/switzerland/supersaver-tickets-saver-day-passes.html
If you want a more detailed answer, please let us know why ticket you are intending to buy.
Kind regards,
Roland