LyX ⇒ [Preamble Variables]

[NekoGaDaisuki]

Hello,
I am a candidate for a phd in computer science. During my master i've had to write a memoir. Because in my university Latex is overused compared to lyx that is almost never used nor known, i've written my memoir using lyx. The end result is a lyx master file with subdocuments.
In the master file, i needed to put some latex in the preamble of this file. Since a few teachers left latex templates, i used one of them and did the work on lyx to optimise the time.

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Code, edit and compile here:

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\usepackage{palatino}
\usepackage{amsfonts}\usepackage{multirow}
\usepackage{colortbl}\usepackage{xspace}
\usepackage{varioref}
\usepackage{xcolor}
\usepackage{graphicx}
\usepackage{appendix}
\newcommand{\version}[1]{\def\theversion{#1}}
\newcommand{\subtitle}[1]{\def\thesubtitle{#1}}
\newcommand{\authors}[1]{\def\theauthors{#1}\author{#1}}
\newcommand{\supervisor}[1]{\def\thesupervisor{#1}}
\newcommand{\tutor}[1]{\def\thetutor{#1}}
\newcommand{\authorname}{Author}
\newcommand{\authorsname}{Authors}
\newcommand{\supervisorname}{Supervisor}
\newcommand{\tutorname}{Tutor}
\newcommand{\thepartname}{Part}
\ifdefined\addto{%
\addto{\captionsfrench}{\renewcommand{\authorname}{Auteur}}%
\addto{\captionsfrench}{\renewcommand{\authorsname}{Auteurs}}%
\addto{\captionsfrench}{\renewcommand{\supervisorname}{Superviseur}}%
\addto{\captionsfrench}{\renewcommand{\tutorname}{Tuteur}}}
\addto{\captionsfrench}{\renewcommand{\thepartname}{Partie}}
\else{}
\fi
\pretitle{\flushleft\Huge\textsf}
\posttitle{\\[-.65em]\rule{\linewidth}{1.5mm}\\[-.65em]
\ifx\thesubtitle\undefined%
\else%
  \hfill{\small\itshape \thesubtitle}%
\fi
\centering
 
 
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Run LaTeX here

Is there any way to define variables such as author, supervisor and tutor outside of the preamble and directly in the "document" ?