Welcome, mkurdziel4.
😉 The moderator will probably move this thread to the Library Parts or Working in ArchiCAD forum. It is perhaps a language problem - but the "wish" forums are not where you ask questions. They are where you ask Graphisoft to include a feature that does not exist.
You can create any kind of irregular opening or niche in your wall. This is done by creating the shape as a slab (and possibly other elements) on the ground, displaying the assembly in 3D and choosing File > GDL Objects > Save and saving as a Door or Window (see icons in the dialog). The hole-cutting slab - which can be completely free-form and curvy - must have "wallhole" as the ID ... or if you only want a niche, "wallniche".
The process is described in various threads here on the forums - search for the word "wallhole". Also, you'll find a description of this in the online help files in the book Intro to Object Making - or just go to Help and the search tab, and search for "wallhole" or "wallniche".
Naturally, if your wall is actually a collection of walls, cutting the hole is trickier.
Another approach, if all you need is a hole without any trim, glass, etc. is to just create a cutting mass and use solid element subtraction to create the hole.
Have fun with it,
Karl
AC 28 USA and earlier • macOS Sequoia 15.4, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB
