First: The Headline is not very good; I apologise for this. I could not come up with anything better.

Now, consider the following MWE:
Code: Select all
\documentclass{article}
\usepackage{hyperref}
\begin{document}
\tableofcontents
\vspace{5cm}
\section{Introduction}
\label{IntroOne}
\section{Further Introduction}
\label{IntroTwo}
\part{The First Part}
\label{PartOne}
\section{The First Section in the Actual Text}
\label{SectionOne}
\end{thebibliography}
\end{document}
How do I do this?
Thank you in advance!
P.S. If I use the following rather ugly attempt, I get rid of the numbers but the ToC entries before the first part are not interactive.
Code: Select all
\documentclass{article}
\usepackage{hyperref}
\begin{document}
\tableofcontents
\vspace{5cm}
\section*{Introduction}
\label{IntroOne}
\addtocontents{toc}{\protect\section*{Introduction}}
\section*{Further Introduction}
\label{IntroTwo}
\addtocontents{toc}{\protect\section*{Further Introduction}}
\part{The First Part}
\label{PartOne}
\section{The First Section in the Actual Text}
\label{SectionOne}
\end{document}