Do I need to book some intra-Europe tickets to apply for Schengen visa?

Question

I already booked my ultra-Europe ticket which was a roundtrip from YVR to ZRH.

However, I am not sure whether I need to book for intra-Europe tickets for my visa application.

Answer 1

In a nutshell, you don't need to buy anything (not even the ticket out of the Schengen area) but you need to credibly establish the purpose of your trip. And sometimes a reservation could help with that.

See Does Schengen visa proof of transport requirement include travel inside Europe? for a discussion of the underlying logic in a somewhat different context.