\documentclass[a4paper,10pt]{article}
\usepackage[czech]{babel}
\usepackage[cp1250]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{alltt}

\newcommand{\oddel}{\noindent\hrulefill\par}
\newcommand{\oddelt}{\noindent\dotfill\par}

\begin{document}


\begin{itemize}
\item chleba
\item mlíko
\item rum
\begin{itemize}
\item tuzemák
\begin{itemize}
	\item[?] ahoj
	\item čau
	\item nic	
\end{itemize}
\item Havana
\end{itemize}
\item cigára % změna itemu
\end{itemize}\oddelt

\begin{enumerate}
\item chleba
\item mlíko
\item rum
\begin{enumerate}
\item tuzemák
\item Havana
\end{enumerate}
\item cigára
\end{enumerate}\oddelt

\end{document}