%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  2. Auflage
%% 
%%  Beispiel 05-03-5 auf Seite 134.
%% 
%%  Copyright (C) 2016 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]{screxareport}
\pagestyle{empty}
\usepackage{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\setlength{\parindent}{0em}
\RedeclareSectionCommand
  [style=section,
   beforeskip=-3.5ex plus -1ex minus -.2ex, afterskip=2.3ex plus.2ex,
   font=\normalfont\LARGE\bfseries, indent=0pt, tocindent=0pt, tocnumwidth=2.5em]{chapter}

\RedeclareSectionCommand[counterwithin=chapter,tocindent=1em,tocnumwidth=2.5em]{section}
\RedeclareSectionCommand[tocindent=2em,tocnumwidth=1.5em]{subsection}
\RedeclareSectionCommand[tocindent=3em,tocnumwidth=1.25em]{subsubsection}

\DeclareSectionCommand
  [level=4,style=section,
   beforeskip=-3.25ex plus -1ex minus -.2ex, afterskip=1.5ex plus .2ex,
   font=\normalfont\normalsize\bfseries, counterwithin=subsubsection,
   indent=0pt,tocindent=4em, tocnumwidth=1.5em]{subsubsubsection}

\RedeclareSectionCommand
  [level=5,
   beforeskip=-3.25ex plus-1ex minus-.2ex, afterskip=1.25ex plus .1ex,
   font=\normalfont\normalsize\bfseries, indent=0pt,tocindent=5em,
   tocnumwidth=2em,
   counterwithin=subsection]{paragraph}

\RedeclareSectionCommand
  [level=6,
   beforeskip=-3.25ex plus-1ex minus-.2ex, afterskip=1.25ex plus .1ex,
   font=\normalfont\normalsize\bfseries, indent=0pt,tocindent=6em,
   tocnumwidth=1.75em,
   counterwithin=paragraph]{subparagraph}

\DeclareSectionCommand
  [level=7, style=section,
   beforeskip=-3.25ex plus-1ex minus-.2ex, afterskip=1.25ex plus .1ex,
   font=\normalfont\normalsize\bfseries, counterwithin=subparagraph,
   indent=0pt, tocindent=7em, tocnumwidth=1.75em]{subsubparagraph}

\setcounter{secnumdepth}{7}
\setcounter{tocdepth}{7}
\renewcommand\thechapter         {\arabic{chapter}. Teil}%                   1.
\renewcommand\thesection         {§ \arabic{chapter}\ \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)
\makeatletter
\let\chaptermark\@gobble % Damit keine doppelte Ausgabe erfolgt
\let\subsubsubsectionmark\@gobble % "
\let\subsubparagraphmark\@gobble % "
\makeatother
%StartShownPreambleCommands
\documentclass[ngerman,paper=a6,DIV=15,pagesize]{scrreprt}
%StopShownPreambleCommands
\begin{document}
\tableofcontents \newpage
\chapter{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}