How to make one surface out of many untrimmed surfaces?
Thanks in Advance
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Upload definition and make sure to internalize geometry we can work with an image.
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Explain better what you want. To make one surface out of many generally one uses Brep Join which you are already using, so it is not clear what you want. Isotrim component is not for joining surfaces, it is for trimming/splitting them.
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Try to plug your SubD into a Brep component directly to have a clsoed polysurface/brep
In that case, With the help of Isotrim, I want to divide surface into smaller ones and create extruded panels along the surface (shown by blue lines in the picture).
I think this is the wrong way to create panels (for example rectangular) along surface. And now I am just thinking about how to find the right way to do it.
Thanks for your Answer
Do you want to join in all together or split it in panels?? 
You cannot divide a polysurface. It need to be a surface.
A possible approach would be to create a new surface, by getting the side edge and extruding, that way you will have a surface.
Not much else I can do without your grasshopper file.
panels.gh (14.1 KB)
