Sub Articulo 60.1
You will have to redefine itemize in your style file. A logical way to do
this would be:
\def\itemize{%
\ifnum\@itemdepth>4\@toodeep\else\advance\@itemdepth\@ne
\edef\@itemitem{labelitem\romannumeral\the\@itemdepth}%
\list{\csname\@itemitem\endcsname}%
{\def\makelabel##1{\hss\llap{##1}}}\fi}
The four in the first line of the definition means that there are now five
levels of itemize. Now \itemize will not give errors any more about ``Too
deeply nested.'' After having done this, you will probably want to have
something like a dot or dash for your fifth itemize level. This can be
defined by adding
\def\labelitemv{+}
in your style file. This will cause the ``+'' to be used on the fifth
level of itemize. You can just write another symbol here. When you save
these definitions in a file fiveitems.sty, you should not get any errors
on the following .tex file:
\documentclass{article}
\begin{document}
\begin{itemize}
\item first
\begin{itemize}
\item second
\begin{itemize}
\item third
\begin{itemize}
\item fouth
\begin{itemize}
\item fifth
\end{itemize}
\end{itemize}
\end{itemize}
\end{itemize}
\end{itemize}
\end{document}