Without more details it is impossible to accurately answer that.

All entries to a mobile pass can be removed and deactivated up until 23.59 before the day.

Individual trains can always be removed and replaced in the pass.

The last activation date of a pass must be adhered to and any refund or replacement is dependent on the terms when you bought the pass.

You can always add or remove trains, if that's what you mean.

yes, thats what I meant. the described procress from planning the trip.. then activate your ticket seemed to me that there is may be no way back thanks for your help!