[Tex/LaTex] Center chapter name in the table of contents

Question

I am adding chapter name for a set of sections with the following code:

\addcontentsline{toc}{section}{\protect\numberline{}Chapter I}

However, Chapter I is left-sided. What I want is something like:

        Chapter I

1. Introduction...

2. Related work

3. ...

        Chapter II

6. Section bla bla

where Chapter I and Chapter II are centered.

How can I enforce that without touching my document class?

I found an ugly, yet effective solution:

\addcontentsline{toc}{part}{\protect\centering{}Chapter I}

It is not really chapter, but part with the name Chapter I. I know that this is ugly solution. When I used section or chapter, it was kind of merging with the next line or being centered in the first half of the widthline.

Answer 1

Since you are using the journal class informs3.cls, it does not provide \chapters. You can modify \chapter to insert a "chapter-like entry in the ToC" or merely write what you want to the ToC. I've done the latter since it's faster/easier:

\documentclass{informs3}% https://www.informs.org/Find-Research-Publications/INFORMS-Journals/Author-Portal/LaTeX-Style-Files
\newcommand{\chapter}[1]{%
  \addtocontents{toc}{{\protect\centering\itshape #1\par}}
}
\begin{document}
\tableofcontents
\chapter{Methodology}
\section{Introduction}
\section{Related work}
\section{More stuff}
\chapter{Residual}
\section{Final remarks}
\section{Conclusions}
\end{document}

You may want to add similar titles/headings in your main document. However, that's left to you.