%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  1. Auflage
%% 
%%  Beispiel 05-03-12 auf Seite 146.
%% 
%%  Copyright (C) 2012 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1,2
%% 
%% 
\documentclass[ngerman,paper=a6,DIV=15,pagesize,numbers=noenddot,toc=flat]{screxa}
\pagestyle{empty}
\usepackage{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\setlength{\parindent}{0em}
\usepackage{titlesec}
\titleformat{\part}{\normalfont\LARGE\bfseries}{\arabic{part}. Teil}{1em}{}
\titlespacing{\part}{0pt}{-3.5ex plus -1ex minus -.2ex}{2.3ex plus.2ex}
\titleclass{\subsubsubsection}{straight}[\subsubsection]
\titleformat{\subsubsubsection}{\normalfont\normalsize\bfseries}%
                               {\alph{subsubsubsection})}{1em}{}
\titlespacing{\subsubsubsection}{0pt}{-3.25ex plus -1ex minus -.2ex}{1.5ex plus .2ex}
\titleformat{\paragraph}{\normalfont\normalsize\bfseries}%
                               {\alph{subsubsubsection}\alph{paragraph})}{1em}{}
\titlespacing{\paragraph}{0pt}{-3.25ex plus-1ex minus-.2ex}{1.25ex plus .1ex}
\titleformat{\subparagraph}{\normalfont\normalsize\bfseries}{(\arabic{subparagraph})}{1em}{}
\titlespacing{\subparagraph}{0pt}{-3.25ex plus-1ex minus-.2ex}{1.25ex plus .1ex}
\titleclass{\subsubparagraph}{straight}[\subparagraph]
\titleformat{\subsubparagraph}{\normalfont\normalsize\bfseries}%
                              {(\alph{subsubparagraph})}{1em}{}
\titlespacing{\subsubparagraph}{0pt}{-3.25ex plus-1ex minus-.2ex}{1.25ex plus .1ex}
\makeatletter
\newcounter{subsubsubsection}[subsubsection] \newcounter{subsubparagraph}[subparagraph]
\@addtoreset{section}{part}
\@addtoreset{paragraph}{subsubsubsection}
\renewcommand\thepart            {\arabic{part}. Teil}%                       1. Teil
\renewcommand\thesection         {§ \arabic{part}\ \Alph{section}.}%          § 1 A.
\renewcommand\thesubsection      {\Roman{subsection}.}%                       I.
\renewcommand\thesubsubsection   {\arabic{subsubsection}.}%                   1.
\renewcommand\thesubsubsubsection{\alph{subsubsubsection})}%                  a)
\renewcommand\theparagraph       {\alph{subsubsubsection}\alph{paragraph})}%  aa)
\renewcommand\thesubparagraph    {(\arabic{subparagraph})}%                   (1)
\renewcommand\thesubsubparagraph {(\alph{subsubparagraph})}%                  (a)
\setcounter{secnumdepth}{8}  \setcounter{tocdepth}{8}
\renewcommand*\l@section{\@dottedtocline{0}{0em}{3em}}% kein Abstand links
\newcommand*\l@subsubsubsection{\@dottedtocline{3}{3.8em}{3.2em}}
\newcommand*\l@subsubparagraph{\@dottedtocline{5}{10em}{5em}}
\StartShownPreambleCommands
\documentclass[ngerman,paper=a6,DIV=15,pagesize,numbers=noenddot]{scrartcl}
\usepackage{titlesec}
\StopShownPreambleCommands
\begin{document}
\tableofcontents \newpage   \part{Die Oberste Ebene}
\section{Überschrift mit section}      \section{Noch eine}
\subsection{Überschrift mit subsection}\subsection{Noch eine}
\subsubsection{Überschrift mit subsubsection}\subsubsection{Noch eine}
\subsubsubsection{Überschrift mit subsubsubsection}
\paragraph{Überschrift mit paragraph}      \paragraph{Noch einer}
\subparagraph{Überschrift mit subparagraph}\subparagraph{Noch einer}
\subsubparagraph{Überschrift mit subsubparagraph}\subsubparagraph{Noch einer}
\end{document}