When planning my trip I have a pass for myself and a child’s pass (free) for my daughter who will be under 12 the entire time.
My question is, how do I do travel planning so that we are both on the same trips and seated together? Do I have to essentially put her in her own trip and manually duplicate everything and just watch seating charts?
You can add a journey to both trips at the same time.
Making reservations is entirely separate from the pass. You'll be seated together, if possible, if you make the 2 reservations together.
Check this page for the best places to book:
https://www.seat61.com/interrail-and-eurail-reservations.htm
Reservations are separate from your pass so you just make two reservations together for those trains where reservations are needed. Just entering a Journey to your Trip doesn't make any reservation.
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