Use REPEAT MACHINING, this operation can be found under the Machining Menu item on the main DCAM screen.
No post modifications required. This can repeat a series of operations in X, Y and also Circular repeats.
This and more info including some screen shots is available in the answers to a multiple part machining question I asked a while back (on page 2 now)
Here is a link to the thread:
http://www.cnczone.com/forums/showthread.php?t=51755 (Easy multiple part method like G98 for sheetmetal??)