How do I make a closed polysurface from surface extrusions? Pic showing what I want to do

I want to make a closed polysurface from surfaces like in this photo. I don’t remember how to do it.
Thank you

Try _CreateSolid

You may need to explode, then join the extrusions to convert them to surfaces or polysurfaces.

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Explode by itself converts an extruision to a surface or surfaces. Join is only needed it the result is multiple surfaces and a polysurface is desired.

ConvertExtrusion converts an extrusion to a surface or polysurfaces. The result is the same as Explode followed by Join.

You are right, of course. Your post gives the details I glossed over.