The -o number-up option places multiple documents pages on a single printed page. CUPS supports 1,2,4,6,9, and 16-Up formats.
lp -o number-up=X file
Print all 16 pages of file "myfile.txt" on one page:
lp -o number-up=16 myfile.txt
To tell the printer how many pages you want on one page, you can replace the X with 1,2,4,6,9, or 16.