Hi, I would like to have my first question driving specific survey groups to ensure that the respondees will get relevant questions based on their job role provided in that question. So basically their response should trigger different set of questions. How can I do that? Thank you.

Use question relevance.

Read about it in the manual
manual.limesurvey.org/Question_type_-_Li...)#Relevance_equation
or
manual.limesurvey.org/Expression_Manager...ation.2FBranching.29

Short description:
If the answer to your "job role" question ("JR") has code "1,2,3,4", and one next question is only to be displayed to respondent who ansered "1", you enter in the relevance equation of this question "JR==1", meaning: This question is only displayed, if the answer to "JR" was "1".
Or you enter "JR==1 OR JR="; you can imagine, what it means.
Of course you enter this without the quotes.

Joffm