Nintex Forms - Best way to link 2 SharePoint lists into one Form

@CCMODERATOR ....when you say sensitive, in what way? I mean who should be able to see and who should not be able to see? e.g. Created By, Modified By, Workflow Initiator, etc.

@CCMODERATOR .....How about below approach?

• List A will contains all the columns of list B too
• When user submits the form (assuming they won't be modifying the list B or list A after creating a new item)
• Once they submit the form in list A, trigger the workflow in list A:
  • Create items in list B (capture ID of list B for reference purpose)
  • After creating items, set all the columns used for creating list B as blank (this is to make sure no one sees list B's info)
  • Now on list B, create a workflow which will trigger when an item is created
    • Put a couple minutes pause - This is to make sure an item is created and all the columns have been updated
    • Set item permission - Break the inheritance and set the item permission as needed
      • List will have same permission as list A
      • Inheritance will be broken and item permission will be set (not a big fan of setting item permission)
  • You can also explore an option to run workflow as the owner
  • Also if you want them to modify the item, you still have ID value of list B item in list A...maybe you can use that to update item from list A to list B.