RolandP Thank you assistance.
The route in question is:
Frankfurt(M) Flughafen Fernbf to Luzern via Basel SBB. Th, 22.05.2025. Departure: 09:51 (ICE 103 Direction -> IC 21 675 Direction Lugano)
And thank you for the link. However, I haven’t reached the point where I can make seat reservations - which only appears to apply to the first half of the route from Frankfurt(M) Flughafen Fernbf to Basel
I intend to secure 1st class tickets for 7 travelers, full fare.
To recap, the site doesn’t allow purchasing more than 5 tickets and the “international group journeys” page supports purchasing tickets for groups of 10 or more. How should I secure ticket for 7 travelers?