Could you please help me understand why my application of this solution (cascading selection from external source) is not working? :)

[Kal_Lam]

Welcome to the community, @fbclima! Have you gone through these two posts discussed previously? It should help you solve your issue:

Cascading Limitation

@dimesh, seems like you have a lot of choices in your cascading select option. Please be informed that in such cases you will need to use the external CSV to list the choices. You could overcome this limitation as outlined in the post discussed previously (using the select_one_from_file question type): Alternatively, you could also overcome this issue by using the select_one_external question type as outlined in the post discussed previously: