Evgeniy;
My question was in general, since I noticed that the topic is how to generate a pline from a list of points, all the code provided was just for straight pline...
Here is one code to generate a pline with straight and curve segments.
Download the ZIP file.... please and open pline_vlisp.lsp
Have fun.
Luis Esquivel
Correction: Removing the code and placing it into a ZIP file...