I am trying to make a Registration form for my department. We have Divisions and under each divisions we have several Sections. My purpose was during registration if an employee selects Division only Sections related to that Division alone should show; not all the sections. Like we select country only that country states get displayed. Similarly is it possible to autopopulate feild using Joomla User Fields.
You can use the "showon" field attribute to hide/show a field depending upon the value of another field. So you could have lots of Sections fields - one for each Division - and show only the appropriate Section field based on the value of the Division field. As all this is going to be fairly dynamic you'd want to build up your form dynamically from Division/Section data in a database table - see eg https://docs.joomla.org/Advanced_form_guide#Dynamically_Changing_Forms - rather than defining it in an XML file.
Or as Jonboy suggests, find an appropriate 3rd party extension; I can't help there, I'm afraid.