Which journey do you want to reserve?
Hallo, danke - grundsätzlich mehrere Reisen, aber als Erstes Köln-Bordeaux am 24.10.23 um 6.44 Uhr.
So it is often cheaper to book your reservations elsewhere than on interrail.eu.
More info about seat reservations in general : https://www.seat61.com/interrail-and-eurail-reservations.htm
Eurostar/Thalys to Paris : 32€ through https://www.b-europe.com/EN/Booking/Pass#TravelWish (4€ fee per order). You're lucky that there are still seats left, usually this route sells out days or weeks in advance (passholder quota too) !
TGVs within France : 10€ limited fare, then 20€. Use https://travel.b-europe.com/Eurail-GE/en/booking-tgv#TravelWish
The RER from Gare du Nord to Gare Montparnasse is not included. You should be able to buy tickets onboard the Eurostar so you don't have to queue in Paris !
It would be cheaper but a bit longer to go via Strasbourg. Just pointing that out as an alternative. :)
Ah, hatte ich mir alles etwas einfacher vorgestellt. Vielen Dank für die Tipps.
You should be able to buy reservations on interrail.eu but sometimes it doesn't work and there are extra fees. Better to go through the railway company whenever possible.
France and Spain have a lot of mandatory reservations which limits your flexibility. Italy is better and the rest of Europe works well.
Enjoy your trip and do not hesitate to ask othrr questions !