How do i use cascading select within ranking question in KoBoToolbox?

Dear Sir,
Below I am giving some examples, which I want to put in Kobo form.

What Type of Job you want (Select Many)
Options are - 1. Govt
2. Private
3. Business
4. Farming
5. Small Scale Industries
What is your 1st preference (Condition - Which has been selected from 1st questions)
What is your 2nd preference (Condition - Which has been selected from 1st questions)
What is your 3rd preference (Condition - Which has been selected from 1st questions)

Query 2 - While adding Ranking Question, I want only some of them mandatory. Is it possible?

Please guide me.