\newcounter{Sectioncounter}
\newcounter{SubSectioncounter}

\newcommand{\Section}[1]
{ {
\vspace{24pt}
\addtocounter{Sectioncounter}{1}
\setcounter{SubSectioncounter}{0}
\begin{center}
{\bf \arabic{Sectioncounter}. #1}
\end{center}
} }

\newcommand{\SubSection}[1]
{ {
% \vspace{24pt}
\addtocounter{SubSectioncounter}{1}
\begin{center}
{\em (\alph{SubSectioncounter}) #1}
\end{center}
} }