Hot to connect these two solid

[rdjavi]

I have not idea how to connect two solid from the picture below so I would be grateful if somebody help me. dwg file attached.

[leeminardi]

There are several ways to address this modeling challenge. I created an oversized  box (blue) of the correct thickness and then used the ALIGN command to position the rectangular along the bottom edge and thru the top left corner of the red piece in the image below.  I then constructed a few boxes that were used to trim the blue piece with Boolean subtract operations.  UNION was used to make the final result one piece.

[tramber]

Yes, there are several ways.

One of them is to consider a massive construction and a "shell" option of the _solidedit command.

You would have to learn how to deselect the right faces before ending the command.

But I'm sure you want find any faster and efficient way

Look at the attachement. It is only 1 step between the 2 bodies.

 

[parkr4st]

loft between profiles

[rdjavi]

Thanks for your help! I apologize for the delay with the reply, I had a lot of work.

I found a one solution, look at the picture. Notice that another solid is not straight and that there is a corner on top and that's why I did not know at first how to draw it.