Hi Weng,
In the sample you provided, both of the questions appeared as select_ones. Which workflow are you trying to support:
- have a select_multiple question populate the answers for a select_one question
- have a select_one question populate the answers for a select_multiple question
- have a select_multiple question populate the answers for a select_multiple question
Regardless, we currently do not have support for cascading selects interacting with select_multiples.