InfoPath Dev

Requerement is very simple. i have diff kind  of survey Questions in
database and i would like to populate in to infopath form in below
format.
Questions format is :(This below format is already designed in data
base.)
                  Main Question 1
                        Sub QuestionA
                              Sub QuestionsA1
                              Sub QuestionsA2
                        Sub QuestionB
                              Sub QuestionsB1
                              Sub QuestionsB2

                  Main Question 2
                        Sub QuestionA
                              Sub QuestionsA1
                              Sub QuestionsA2
                        Sub QuestionB
                              Sub QuestionsB1
                              Sub QuestionsB2

Display method : 1.When form load only main Questions should display
(Rest all Hide)
               2.When CLICK mainquestionA1 checkbox , Sub QuestionA and
Sub QuestionB should display
              3. When CLICK Sub QuestionA checkbox , Sub QuestionA1 and
Sub
QuestionA2 should display.

pls help me to how to proceed or any easy method, i felt TreeView
control might solve this problem, if any other solution then i
appriciate.

From a UI perspective a treeview control would work. You could do it in the task pane and then have the details show up in the form depending on what the user selects.

 Another method would be to have more of a wizard flow which might be easier for novice users.