sheetmetal design problem

[arca]

How can I design the following shape in Sheet metal design environment of Catia? So that I can fold or unfold it whenever I want.
The figure below helps to better explain what I mean. Pay attention to the shape of the tongue and groove in the corner.

 

[MrCATIA]

Are you sure you want to use the Sheet Metal workbench for this? The Sheet Metal tools are intended to be used with flat sheets that are cut and bent. Not square tubing.

Is there a reason why you want to show the bending?

Why not have two models (one folded and the other unfolded)? as I suggested in your other post

 

[arca]

Of course, I have no insistence on using the Sheet Metal workbench. It is only important to me to be able to obtain, for example, a quadrilateral frame by cutting parts of a one-piece square tube and bending it.
I don't want to have four separate parts for a quadrilateral frame.