# Suppress section numberrs in TOC

I am creating a file, where the section headings should have box around the number. Also, some sections should not display this number even though the box should still be there. To solve this, I created two environments using titlesec, where in one environment the number has a different color than the box fill color, while in the other the colors match.

The problem I have is that both section numbers are displayed in the TOC. I looked up titlesec documentation and it mentioned something about using the \ifthesection condition to suppress numbers in TOC, but I cannot figure out how to do that.

I am attaching an example, with some dummy sections and the environments. I don't want the number for Exercises A (section 0.2) to be displayed. Can someone help me out on this?

Thank you,

Raman

\documentclass[10.5pt,hidelinks]{book}
\usepackage[T1]{fontenc}
\usepackage{uarial}
\usepackage[ paper=a4paper,  layoutheight = 8.2in, layoutwidth  = 6in, layoutvoffset= 35mm, layouthoffset = 29mm, margin=0pt, includeheadfoot, showcrop=true]{geometry}
\usepackage{multicol}
\usepackage{titlesec}
\usepackage{lipsum}
\usepackage[english]{babel}
\usepackage{blindtext}
\usepackage{helvet}
\usepackage{tikz}
\newcommand\sectionbar{%
\tikz[baseline,trim left=2.1cm,trim right=2.0cm] {
%               \fill [black] (2.0cm,-0.3ex) rectangle (\textwidth+3.1cm,-0.1ex);
\node [
fill=lightgray,
anchor= base east,
rectangle,
minimum height=3.5ex, minimum width=3.5ex] at (3cm,0) {
%                   \color{white} \textbf{\arabic{\section}}
\color{white}   \textbf{\thesection}
};
\fill [black] (\textwidth-13.15cm,-0.9ex) rectangle (\textwidth+2.1cm,-1.1ex);
}%
}
\titleformat{\section}{\large\bfseries}{\sectionbar}{1.5cm}{}

\newcommand\exercisebar{%
\tikz[baseline,trim left=2.1cm,trim right=2.0cm] {
%               \fill [black] (2.0cm,-0.3ex) rectangle (\textwidth+3.1cm,-0.1ex);
\node [
fill=lightgray,
anchor= base east,
rectangle,
minimum height=3.5ex, minimum width=3.5ex] at (3cm,0) {
%                   \color{white} \textbf{\arabic{\section}}
\color{lightgray}   \textbf{\thesection}
};
\fill [black] (\textwidth-13.15cm,-0.9ex) rectangle (\textwidth+2.1cm,-1.1ex);
}%
}

\newenvironment{exercises}
{\titleformat{\section}{\large\bfseries}{\exercisebar}{1.5cm}{}
%   \setcounter{secnumdepth}{0}%
%   \renewcommand\sectionmark[1]{}
}
{%\setcounter{secnumdepth}{2}
}
\begin{document}
\tableofcontents

\section {LEARNING OBJECTIVES}
\blindtext \\
\lipsum[1]

\begin{exercises}
\section{Exercises A}
\blindtext
\lipsum[2-3]
\end{exercises}

\section{Exercises B}
\blindtext
\lipsum[4-5]

\end{document}


I believe I found the most worst solution:

\newenvironment{exercises}{%
\titleformat{\section}{\large\bfseries}{\exercisebar}{1.5cm}{}
\string\let\string\oldnumberline\string\numberline%
\string\renewcommand\string\numberline\string[1]\string\oldnumberline{\strut}}%
}%
}{%
\setcounter{secnumdepth}{2}
\string\let\string\numberline\string\oldnumberline%
}
}