Hi @u8031708
With more than 10 pax, you count as a group. Therefore, there is a group luggage transfare sameday available, see https://www.sbb.ch/en/station-services/before-your-journey/luggage/group-luggage/group-luggage-door-...
Unfortunately, you have to have a group ticket to use the customized sameday group luggage service. In this case, I recommend you to contact the SBB Contact Center to discuss this issue with a service agent: Tel. +41 848 44 66 88 (CHF 0.08/min.) (available 24/7, sometimes you may be required to wait)
I wish you a nice stay in Switzerland.
LG, uebe
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