In the meantime would also advise you to have a look at a simple workaround that should help you better understand the concept of a cascading select question. You could follow the same here:
And also follow a bit complicated cascading select here:
Having looked at your xlsform i could see that you have a lot of choices in your cascading select questions. This could slowdown your form loading and data collection process. You could thus use the select_one_from_file approach to overcome these issues following the instructions outlined in the post discussed previously:
