Not sure how detailed of an explanation your looking for here. It's as simple as drawing you're part in a CAD program, and copying and pasting it as many times as will fit on your board (and that your machine can reach). Then Use a CAM program to convert the drawing to g-code. Load the g-code and run your parts. There are some videos in this thread that show someone doing basically what your asking for.
http://www.cnczone.com/forums/showthread.php?t=33580