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Hi Yup,
Thanks for your question!
First of all, there’s no need to register or create an account anywhere to reserve your seats. Nor do you need a product number. You probably have the “SwissPass” card in mind. That’s indeed a card with a number, but it’s a product for Swiss residents. Even though the names sound alike, it has nothing to do with your Swiss Travel Pass. The difference is explained at https://www.myswissalps.com/travel/tickets/residents/
You can make seat reservations for the Luzern-Interlaken Express through the website of the Zentralbahn, and reservations for the GoldenPass Express Interlaken-Montreux through the MOB website.
You’ll find the links and step-by-step booking instructions on https://www.myswissalps.com/activity/goldenpass/#price. Make sure to click the green “Show more” button to read the entire section.
I hope this helps. Good luck :-)!
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