>Is it possible to convert pcl file to ps(postscript) file?
Yes.
> and if yes how can this be done?
You have to find or buy software to do it. Adobe do not have any such
software, but I think it exists.
>Is it possible to create a ps file as output through programming in VB6?
Certainly. The usual thing is to print from VB to a print driver using
drawing instructions. In this case the result is PCL, PostScript, or
whatever it needs to be according to the print driver.
Aandi Inston