EN
Our aim in this article is the study of subextension and approximation of plurisubharmonic functions in $𝓔_χ(Ω,H)$, the class of functions with finite χ-energy and given boundary values. We show that, under certain conditions, one can approximate any function in $𝓔_χ(Ω,H)$ by an increasing sequence of plurisubharmonic functions defined on strictly larger domains.