documentclass[a4paper,11pt,oneside]{article}
usepackage[utf8]{inputenc}
usepackage[T1]{fontenc}
usepackage[frenchb]{babel}
begin{document}
 begin{itemize}
   item  First Level
   begin{itemize}
     item  Second Level
     begin{itemize}
       item  Third Level
       begin{itemize}
         item  Fourth Level
       end{itemize}
     end{itemize}
   end{itemize}
 end{itemize}end{document}