~/Documents$ mkdir 'Reports 2016'
~/Documents$ for M in Oct Nov Dec; do \
  mv -v "Reports $M 2016" "Reports 2016/$M"; done
‘Reports Oct 2016’ -> ‘Reports 2016/Oct’
‘Reports Nov 2016’ -> ‘Reports 2016/Nov’
‘Reports Dec 2016’ -> ‘Reports 2016/Dec’
~/Documents$ find . ! -type d -printf '%y %p\t%l\n'
f ./Reports 2016/Oct/Report Weeks 40-42.xls	
f ./Reports 2016/Oct/Report Weeks 43-46.xls	
l ./Reports 2016/Nov/Report Weeks 43-46.xls	/home/foobar/Documents/Reports Oct 2016/Report Weeks 43-46.xls
f ./Reports 2016/Nov/Report Weeks 47-51.xls	
l ./Reports 2016/Dec/Report Weeks 47-51.xls	/home/foobar/Documents/Reports Nov 2016/Report Weeks 47-51.xls