How to insert the advisor's name in the title page?

[erdodo97]

I managed to do that by adding the advisor's name in the \usebeamerfont{author} command. It is not very elegant but it worked for me, however it would be nice to have a command for such issue. Many thanks ! Here I attached the code I've used.

`\setbeamertemplate{title page}{%
% Reposition the box in an inelegant way - but it works!
\hspace{-12mm}
\vspace{-10mm}
\begin{beamercolorbox}[wd=0.72\textwidth,sep=10pt,leftskip=2.5mm]{title}%
{\usebeamerfont{title}\inserttitle}

{\usebeamerfont{subtitle}\insertsubtitle}

{\usebeamerfont{subtitle}\@courseLabel}

{\usebeamerfont{author}\usebeamercolor[fg]{author}\textbf{\insertauthor} \ifdefempty{\@IDnumber}{}{(\@IDnumber)}\\
Advisor : Prof. X Y}




{\usebeamerfont{date}\usebeamercolor[fg]{date}\insertdate}

\end{beamercolorbox}
}`