Lista de Lista aninhada
\documentclass{article}
\usepackage{enumitem}% http://ctan.org/pkg/enumitem
\begin{document}
\begin{enumerate}
\item First
\begin{enumerate}[label*=\arabic*.]
\item Second
\item Third
\end{enumerate}
\item Fourth
\end{enumerate}
\end{document}
\usepackage{enumitem}
\setlistdepth{15}
\newlist{myEnumerate}{enumerate}{15}
\setlist[myEnumerate,1]{label*=\arabic*.}
\setlist[myEnumerate,2]{label*=\arabic*.}
\setlist[myEnumerate,3]{label*=\arabic*.}
\setlist[myEnumerate,4]{label*=\arabic*.}
\setlist[myEnumerate,5]{label*=\arabic*.}
\setlist[myEnumerate,6]{label*=\arabic*.}
\setlist[myEnumerate,7]{label*=\arabic*.}
\setlist[myEnumerate,8]{label*=\arabic*.}
\setlist[myEnumerate,9]{label*=\arabic*.}
\setlist[myEnumerate,10]{label*=\arabic*.}
\setlist[myEnumerate,11]{label*=\arabic*.}
\setlist[myEnumerate,12]{label*=\arabic*.}
\setlist[myEnumerate,13]{label*=\arabic*.}
\setlist[myEnumerate,14]{label*=\arabic*.}
\setlist[myEnumerate,15]{label*=\arabic*.}
chink
