I'm currently compiling a manual in LaTeX and the manual has 3 parts. For part 1 the chapters are called core, for part 2 the chapters are called QI and for part 3 the chapters are called GP. I want the chapters to look like the photo I attached.
I'm currently using \renewcommand{\chaptername}{} but it also applies that the chapters for Part 2 are called core but I want the chapters for part 2 and part 3 to be different from each other as well.
What command can I use?


package{titlesec}and provide us a MWE (https://tex.meta.stackexchange.com/questions/228/ive-just-been-asked-to-write-a-minimal-example-what-is-that) – flav Nov 26 '19 at 04:32\renewcommand{\chaptername}{}multiple times in your document? – Johannes_B Nov 26 '19 at 05:35\documentclass{book} \let\oldchaptername\chaptername \begin{document} \part{Some part} \renewcommand{\chaptername}{} \chapter{A chapter without name} \chapter{Another chapter without name} \part{Some other part} \renewcommand{\chaptername}{\oldchaptername} \chapter{A chapter with name} \chapter{Another chapter with name} \end{document}. – Nov 26 '19 at 06:01