Column layout in Column and how to edit avia layout builder in code ?

Hi,
first question
i have TWO 1/2 column

i want to place 1/3,1/3,1/3 column inside my 1/2

how do i do that ?
if it is not possible, how do i work around this problem ?

second question

i think in the past, when you use avia layout builder to develop your website, you can switch back to the normal
Visual / text editor

and all the code will be there.
e.g.

[avia layout=1/5]
some code…..etc….
[/avia layout]

Now it is just blank.

There are some changes where it will be much easier to type in the visual / text editor instead of using the avia builder

thanks