Is there an easy way to align the text block with a section title? It should look like this:

1      Introduction
This is an example text.

1.1    Section
This text should also be intended.

1.1.1  Subsection
\ldots :)


PS: I am using the scrreprt documentclass.

Redefine \chapterformat and \@seccntformat appropriately; change the length \mylen according to your needs:

\documentclass{scrreprt}
\usepackage{lipsum}

\newlength\mylen
\setlength\mylen{2cm}

\renewcommand*{\chapterformat}{%
\llap{\protect\makebox[\mylen][l]{\chapappifchapterprefix{\nobreakspace}\thechapter\autodot\hfill}}%
}
\makeatletter
\def\@seccntformat#1{\llap{\protect\makebox[\mylen][l]{\csname the#1\endcsname\autodot\hfill}}}
\makeatother

\begin{document}

\chapter{Introduction}
\lipsum[4]
\section{Text Section}
\lipsum[4]
\subsection{Text Subsection}
\lipsum[4]

\end{document}


• I forgot to mention that i need this for sections, too. There seems to be no \sectionformat to set. – klingt.net Jun 12 '13 at 13:02
• @klingt.net Just sections or also subsections, subsubsections? – Gonzalo Medina Jun 12 '13 at 13:06
• Even sub- and subsubsections, but they should not be intended more than the chapter. – klingt.net Jun 12 '13 at 13:07
• @klingt.net please see my updated answer. – Gonzalo Medina Jun 12 '13 at 13:23