Hi Chrisptophe,

I think the core of the problem is in the ... of your code snippet - i don't know what happens there, so I will assume.

Assuming, that create_element_from_wall is the function that does exactly, what you described (reads attributes of the selected element, it's geometry etc) and returns a new element (it does not create it yet, in the sense of writing in the database), e.g. something like:

def create_element_from_wall(selected_wall: BaseElementAdapter) -> ModelElement3D:
    # reading attributes, geometry, etc...
    return ModelElement3D(...)  # return the element you are talking about

elements_to_create = []
for element in self.selection_result_sel_elements:
    new_element = create_element_from_wall(element)
    elements_to_create.append(new_element)
    
return CreateElementResult(elements_to_create)  # return the result

It's all about creating a list of elements you want to create and then returning it. In ScriptObject, PythonParts framework will take care of it and create all of them in the DF at once. Creating them one-by-one would be way to costly.

Best,
Bart