Arrange many small page in a few big page

Hello to all Experts!

I have 496 pages in one file of Corel Draw X4 at size 8.5*6.5

I want to arrange all 496 pages to 31 A3 pages and then create A3 PDF files.(each 16 pages in one A3 page)

I have no time to copy and paste !!!

I need a speed way to do it!

Please help me soon!

VeryThanks.

Hosein