Luckily for you, Draftsight can export to pdf directly.
What I do is:-
1: Add enough sheets for each section to have its own (Use File/ Sheet/ New Sheet)
3: Copy each section to its own sheet
4: Save again (Just in case... Draftsight can be a little flaky at times)
5: Export as a multi-page pdf ( File / Export / PDF export ).
I've looked into that, but sadly at that point it's really just faster for me to print to individual PDFs and then use a separate program to merge them. I also have to worry about scaling, as there are two or three different paper sizes used in this drawing (and of course, no US paper sizes used).