How to add second set of questions to a list in SharePoint 2010 that would be invisible to the first group?

I made a custom list in SharePoint 2010 and customized it in infopath. The First set of questions are for group A that they need to complete and would see and edit their own inputs and submit. Group C would see, edit and manage all submitted inputs. Now, I need to add a second set of questions to this list that should not be visible to group A. Group C would review the list and send some items of the list to group B for completion. Group B should be able to see the first set of questions for that item and complete the second set of questions and submit. Again, group C should be able to see all submitted inputs with first and second sets of questions. I am stuck on the way of creating the second set of questions. I tried so many things but didn't work. Any advice would be greatly appreciated! Thanks so much!