\documentclass[a4paper,10pt]{article}
\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[portuges]{babel}
\usepackage{footnote}
\usepackage{fancyhdr}
\usepackage{lastpage}
\usepackage{graphicx}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage[geometry]{ifsym}
\usepackage{float}
\usepackage{sectsty,ulem,chngpage,enumitem}
\usepackage{listings}
\usepackage{xcolor}
\usepackage{typearea}
\usepackage{calc}

\usepackage[bookmarksopen=true]{hyperref}
\usepackage[a4paper, twoside, hcentering=false, hmargin={1.8cm, 1.8cm}, vmargin={2.4cm, 2.5cm}]{geometry}

\definecolor{Titulo}{HTML}{006E8C}
\definecolor{TituloAlt}{HTML}{96C4D6}
\definecolor{Tabela}{HTML}{F7E8BD}
\definecolor{TabelaLinha}{HTML}{D9E2E7}

\renewcommand{\rmdefault}{phv}

\makeatletter
\renewcommand*{\@seccntformat}[1]{\csname the#1\endcsname\quad}
\newcommand*{\@seccntformat@section}[1]{\csname the#1\endcsname.\quad}

\let\@@seccntformat\@seccntformat
\renewcommand*{\@seccntformat}[1]{%
  \expandafter\ifx\csname @seccntformat@#1\endcsname\relax
    \expandafter\@@seccntformat
  \else
    \expandafter
      \csname @seccntformat@#1\expandafter\endcsname
  \fi
    {#1}%
}
\makeatother


\newenvironment{lsection}	{\begin{flushleft}\begin{adjustwidth}[]{3.4cm}{}}{\end{adjustwidth}\end{flushleft}}
\sectionfont{\raggedright\bfseries\Large\color{Titulo}\sectionrule{0ex}{0pt}{-1ex}{1pt}}
\subsectionfont{\hspace{-29pt}\raggedright\bfseries\large\color{Titulo}}
\setitemize[1]{label=\color{Titulo}\FilledSquare,       leftmargin=\parindent}
\setitemize[2]{label=\color{Titulo}\FilledDiamondshape, leftmargin=14pt      }
\setitemize[3]{label=\color{Titulo}\FilledSmallCircle,  leftmargin=14pt      }


\begin{document}

\section{General description}
\begin{lsection}
	\subsection{Desdesdfdsfds}
	\begin{itemize}
		\item Deste
		\begin{itemize}
			\item Deste
			\begin{itemize}
				\item Deste
			\end{itemize}
		\end{itemize}
	\end{itemize}
\end{lsection}

\end{document}