List

Nesting enumerate

# Make it 1, 1.1, 1.2, 2, 2.1, 2.2
\renewcommand{\labelenumi}{\arabic{enumi}.} 
\renewcommand{\labelenumii}{\arabic{enumi}.\arabic{enumii}}

# Make it A, a/b/c, B, a/b/c
\renewcommand{\labelenumi}{\Alph{enumi}}
\renewcommand{\labelenumii}{\alph{enumii}}

Change the symbols in the list environment

Define the new environment as

\newcounter{bean}
\newenvironment{iletter}{\begin{list}{(\alph{bean})}{\usecounter{bean}\setlength{\parsep}{-1pt}}}{\end{list}}
\newenvironment{iLetter}{\begin{list}{\Alph{bean}.}{\usecounter{bean}\setlength{\parsep}{-1pt}}}{\end{list}}
\newenvironment{question}{\begin{enumerate}{}{\setlength{\leftmargin}{0pt}%
\setlength{\rightmargin}{\leftmargin}%
\setlength{\parsep}{-10pt}}}{\end{enumerate}}