Ok, I still experimenting different ways to make thing strange depend on how the component we want to remove is made.
Extrude from Sketch (sketch is displaced) : Ok
Box displaced : Problem
Extrude from Draft rectangle : Ok
Protrusion from Sketch (sketch is not displaced but line in sketch are where I want in the whole model) : Ok
Protrusion from Rectangle : Problem
Protrusion from Sketch (sketch is not in its initial Place) : Problem
I think we have already discuting of that in past, it seem that sometimes FreeCAD take the original placement of object (that is in origin).
It seem that extrude always work, and i believe that if we want an object that is sketch based we have to not displace the sketch, but draw profil at the position we want in the sketch plan.
Can we fix that, or have we to explain in wiki and in mind that there is some method that are not allowed to use with Arch wb ? that the question ?