In this paper we give an alternative proof of the construction of $n$-dimensional ordinal sums given in Mesiar and Sempi \cite{mesiar}, we also provide a new methodology to construct $n$-copulas extending the patchwork methodology of Durante, Saminger-Platz and Sarkoci in \cite{durante08} and \cite{durante09}. Finally, we use the gluing method of Siburg and Stoimenov \cite{siburg} and its generalization in Mesiar {et al.} \cite{mesiarjagr} to give an alternative method of patchwork construction of $n$-copulas, which can be also used in composition with our patchwork method.
$n$-copulas, modular functions, rectangular patchwork
60A10, 60E05