%%
%% The LaTeX Companion, 3ed
%%
%% Example 4-1-2 on page I-255 in "Customizing the \protect \nxLenv  {enumerate} list environment".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{159.0pt}
%StartShownPreambleCommands
\renewcommand\theenumi    {\Roman{enumi}}
\renewcommand\theenumii   {\Alph{enumii}}
\renewcommand\labelenumii {\theenumii.}
%StopShownPreambleCommands

\begin{document}
\begin{enumerate}
  \item \textbf{Introduction}      \label{q1}
  \begin{enumerate}
    \item \textbf{Applications}    \label{q2} \\
      Motivation for research
    \item \textbf{Organization}    \label{q3} \\
      Structure of the report
  \end{enumerate}
  \item \textbf{Literature Survey} \label{q4}
\end{enumerate}
q1=\ref{q1} q2=\ref{q2} q3=\ref{q3} q4=\ref{q4}
\end{document}