Here is a possible implementation: it can actually work with every standard theme, but if the theme you developed puts the title in a box you may wonder to get a different effect.
\documentclass{beamer}
\setbeamerfont{supertitle}{size=\LARGE,parent=structure}
\makeatletter
\def\supertitle#1{\gdef\@supertitle{#1}}%
\setbeamertemplate{title page}
{
\vbox{}
\vfill
\begin{centering}
\begin{beamercolorbox}[sep=8pt,center]{title}
\usebeamerfont{supertitle}\@supertitle
\end{beamercolorbox}
\begin{beamercolorbox}[sep=8pt,center]{title}
\usebeamerfont{title}\inserttitle\par%
\ifx\insertsubtitle\@empty%
\else%
\vskip0.25em%
{\usebeamerfont{subtitle}\usebeamercolor[fg]{subtitle}\insertsubtitle\par}%
\fi%
\end{beamercolorbox}%
\vskip1em\par
\begin{beamercolorbox}[sep=8pt,center]{author}
\usebeamerfont{author}\insertauthor
\end{beamercolorbox}
\begin{beamercolorbox}[sep=8pt,center]{institute}
\usebeamerfont{institute}\insertinstitute
\end{beamercolorbox}
\begin{beamercolorbox}[sep=8pt,center]{date}
\usebeamerfont{date}\insertdate
\end{beamercolorbox}\vskip0.5em
{\usebeamercolor[fg]{titlegraphic}\inserttitlegraphic\par}
\end{centering}
\vfill
}
\makeatother
\supertitle{supertitle}
\title{the title}
\author{the author}
\institute{My institute}
\date{\today}
\begin{document}
\begin{frame}
\titlepage
\end{frame}
\begin{frame}{Title of first frame}
text
\end{frame}
\end{document}
This gives:
The problem I said before is due to the fact that I made use of the title
color definition for the beamercolorbox
containing the supertitle.
By means of \setbeamerfont
it is possible to characterize which are the features of the new template supertitle
; once given the definition, that should be applied inside the titlepage
template immediately before the supertitle
insertion to set it with the desired characteristics.
You probably noticed that all elements of the titlepage have this setting. For simplicity, I did not defined a color template for the supertitle
, but I re-used the definition given by the title
. Indeed, for each template in the titlepage, there is also a color template definition, that could be given with \setbeamercolor
. If you want you can define yours by means of:
\setbeamercolor{supertitle}{...}
After that, you should change the previous definition into:
\begin{beamercolorbox}[sep=8pt,center]{supertitle}
\usebeamerfont{supertitle}\@supertitle
\end{beamercolorbox}
For what concern the \inserttitlegraphic
, it is the command that allows to insert (as the name suggests) the logo just in the titlepage. In your presentation you should use the command:
\titlegraphic{...}
I don't know if you are looking for something like this:

Code:
\documentclass[a4paper,12pt]{report}
\usepackage[demo]{graphicx}
\usepackage[framemethod=TikZ]{mdframed}
\newcommand\HRule{\rule{\textwidth}{1pt}}
\newmdenv[%
innertopmargin = 0.8cm,
innerbottommargin = 0.8cm,
backgroundcolor = blue,
linewidth = 0pt,
fontcolor = white
]{mybox}
\begin{document}
\begin{titlepage}
\includegraphics[height=1cm,width=2cm]{logo1}\hfill\includegraphics[height=1cm,width=2cm]{logo2}
\begin{center}
% Upper part of the page
{\LARGE\scshape University\\[2.5cm]}
{\Large\scshape Project\\[3cm]}
% Title
\begin{mybox}
\centering
{\huge\bfseries Title\\[0.1cm]}
{\large\bfseries subTitle}
\end{mybox}
\vspace*{2cm}
{\normalsize\scshape Defended on : December day,year.\\[1cm]}
{\itshape Jury Members\\[1cm]}
{\raggedright President: president\par}
\bigskip
\begin{tabular}[t]{@{}l@{\hspace{3pt}}p{.3\textwidth}@{}}
Examiners: & examiner 1 \\
& examiner 2 \\
& examiner 3 \\
& examiner 4
\end{tabular}\hfill
\begin{tabular}[t]{@{}l@{\hspace{3pt}}p{.2\textwidth}@{}}
Supervisor 1: & supervisor \\
Supervisor 2: & supervisor
\end{tabular}%
\end{center}
\end{titlepage}
\end{document}
One thing: when changing font attributes like in
{\huge\bfseries Title}\\[0.1cm]
this has to be written as
{\huge\bfseries Title\\[0.1cm]}
otherwise the paragraph isn't ended and and this affects the baseline behavior.
For more info see, for example, this answer of mine and the related link.
Best Answer
May be like this: