• This might depend on the used class, so please add a complete MWE to your question. Also IMHO it is a bad idea to remove the numbering from ToC, as it helps orienting in a document a lot. – Skillmon Jul 26 '17 at 11:39
• Did the solution work ? – PTRK Jul 27 '17 at 7:49

Maybe not the best way: put in your preamble

  \newcommand{\shadowsection}[1]{
\stepcounter{section}
}


\frontmatter