I am trying to save catia drawing file in to pdf but its saving only small portion of 2d file. I taken normal catia drawing file A0 size, but my actual drawing size is 10000 x 21000 mm and 1:1 scale.
There are several ways to make a PDF from a CATIA drawing.
If you are using the File + Print method:
change the Print Properties to the paper size that you want the PDF to be, and change the print options to fit the paper.