We have Global 4 day passes. It appears that one can add a global pass to only one "Trip". I see that I can add many "Journies" to a "Trip" in the app.

My question: Is it necessary to add all of the "Journies" we plan to take to the Trip before we activate the pass connected to that "Trip"?

I want to activate the pass for the "Trip" on day 1 for a specific train "Journey," and then wait until days later before I add a "Journey" for day 2 of the pass. I'm not sure if the app will let me do that. Thanks!