Hello ss_ski_93,
A change of seats is not possible with an existing ticket. Depending on the type of ticket, different exchange and refund conditions must be observed.
If you wish to travel in parallel, I recommend that you contact our customer service or go directly to a staffed ticket office.
SBB Contact Center Tel. 0848 44 66 88 (CHF 0.08/min.) (available 24/7, sometimes you may be required to wait)
For data protection reasons, we cannot process your request on this platform.
Friendly greetings, StéphanieB