Pour le placement, rotation mise à l'échelle :
\documentclass{article}
\usepackage{tikz}
\usepackage{lipsum}
\tikzset{quadri/.style={rectangle,draw,text=blue}}
\begin{document}
bonjour
\begin{tikzpicture}[remember picture,overlay]
\node[shift={(current page.south west)},shift={(10,10)},scale=1,rotate=45]
{\begin{tikzpicture}[remember picture,overlay]
\begin{tikzpicture}
\begin{scope}[local bounding box=foo]
\node (A) at (1,0) {$A$};
\node (B) at (5,0) {$B$};
\node (C) at (10,0) {$C$};
\end{scope}
\draw (foo.south west) rectangle (foo.north east);
\node[below of = A,node distance=3cm] (A1) {A1};
\node[below of = B,node distance=3cm] (B1) {B1};
\node[below of = C,node distance=3cm] (C1) {C1};
\draw[->] (A.south) -- (A1);
\draw[->] (B.south) -- (B1);
\draw[->] (C.south) -- (C1);
\end{tikzpicture}
\end{tikzpicture}
};
\end{tikzpicture}
\end{document}
![alt text][1]
[1]: https://i.imgur.com/M3FGwE3.png
