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I am a Master student and currently I am writing the thesis. My University did provide a template but it is in Microsoft Office Word but I am using latex. The attached figure is the example of the heading and the table of content.
I need the word CHAPTER 1 and INTRODUCTION set to center but the section remain on the left. Besides, the tableofcontents generate a different style of TOC compare the template of my University. Any suggestion and modification to make thing works?
Thank You.

documentclass[12pt,a4paper]{report}

usepackage[tmargin=1in,bmargin=1in,lmargin=1.5in,rmargin=1.in]{geometry}



begin{document}

tableofcontents

chapter{INTRODUCTION}

section{What is a flow}

end{document}

Please note, you should not do the numbering of chapters, sections and subsections manually. One of the basic features of LaTeX is, that numbering is done automatically, table of contents is done automatically and also cross references from one section to another is done automatically. All these things are configurable. One feature of KOMA-Script is, that a lot of things are highly configurable. But this needs to use the correct commands. Without using the correct commands you would have to do almost everything manually. This is nothing you would like.

Chapter headings with prefix line "Chapter Nr." can be used with KOMA-Script option chapterprefix. And then you can reconfigure the font sizes, the horizontal and vertical skips and several other attributes of the headings. Here is an example:

documentclass[

  12pt,

% a4paper,% Can be removed, because it is the default.

  chapterprefix,% Use chapter headings with prefix line (see scrguien.pdf).

]{scrreprt}

usepackage[tmargin=1in,bmargin=1in,lmargin=1.5in,rmargin=1.in]{geometry}

% margin (must you use such an ugly margin setup?

% usepackage{times}% http://ctan.org/pkg/times

usepackage{newtxtext,newtxmath}% times is obsolete this is one of the alternatives

setkomafont{disposition}{normalcolorbfseries}% sectfont is deprecated (see scrguien.pdf)

usepackage{scrhack}% to improve e.g. setspace (see scrguien.pdf).

usepackage[onehalfspacing]{setspace}% You can setup onehalfspacing already loading the package.

usepackage[document]{ragged2e}% Note: The option also influences the ToC, LoF, LoT etc.

usepackage{graphicx}

usepackage{amsmath,amssymb,latexsym}

pagenumbering{roman}% seems scrbook would be the better choice

renewcommand*{raggedchapter}{centering}% Avoid usage of sectsty to reduce

                                % the possibility of compatibility issues.

RedeclareSectionCommand[innerskip=baselineskip,afterskip=baselineskip,font=normalsize,prefixfont=normalsize]{chapter}% see scrguien.pdf

RedeclareSectionCommands[beforeskip=-baselineskip,afterskip=baselineskip,font=normalsize]{section,subsection}% see scrguien.pdf

% changes of headings number format:

renewcommand*{chapterformat}{% add MakeUppercase to the original definition

  mbox{%

    MakeUppercase{% added

      chapappifchapterprefix{nobreakspace}%

    }%

    thechapterautodot

    IfUsePrefixLine{}{enskip}}%

}

renewcommand*{sectionformat}{%

  makebox[3em][l]{thesectionautodot}% 3em is the width resevered for the number

}

renewcommand*{subsectionformat}{%

  makebox[3em][l]{thesubsectionautodot}% 3em is the width resevered for the number

}





usepackage{blindtext}% for example dummy text only

begin{document}

chapter{INTRODUCTION}

section{What is flow}

blindtext

section{Gravity current}

blindtext

subsection{Compositional gravity current}

blindtext

subsection{ Particle-driven current}

blindtext

end{document}

resulting in:

Please read an introduction to LaTeX and after the introduction the documentation of the used commands and options in the KOMA-Script manual.