The Latex (or Lyx, a GUI for Latex) "preamble" can be used to set document metadata, like the title, author and date, and add styling, such as headers/footers.
To re-use metadata, create your own variables and reference these wherever you'd like, either in the preamble or in the document itself.
Example preamble:
\newcommand\mytitle{Brighternet Services}
\newcommand\myauthor{Brighternet Ltd.}
\newcommand\myurl{http://brighternet.com}
\newcommand\mydate{01/08/2008}
\title{\mytitle}
\author{\myauthor\space\myurl}
\date{\mydate}
\lhead{Section \thesection}
\chead{}
\rhead{Page \thepage}
\lfoot{\mytitle.\space\myauthor}
\cfoot{}
\rfoot{\mydate}
\renewcommand{\headrulewidth}{0.4pt}
\renewcommand{\footrulewidth}{0.4pt}
\renewcommand{\abstract}{\flushleft}
The example creates 4 variables, called mytitle, myauthor, myurl and mydate. These are reused in the title, author and date metadata declarations and in the footer.
In addition, the preamble sets the header/footer line rule and makes the abstract text left aligned.
Note the use of \space to get a space character.
The custom variables can be referenced elsewhere in your document using the same code as in the preamble. In Lyx, this would be done by inserting via Insert -> Tex Code.
