[-Chris-]

I dont know what version of mastercam your useing but when i want o make an opposite of somthing ive allready programed i save my orginal to a new file name ( so you dont screw up the org.) and then mirror that geometry about the y-axis. That gives you your opposite part, then i go to the operations menu. you'll notice that all are red X'd out. I then go to each operation that need cutter comp and pick the chains by right clicking , a menu drops down and one of the options is to reverse chains click that. do this for each conture or pocket op. Then go back to the main operations menu and select all and do a regen. If you did it correctly all your cuts should be climb cuts Then repost I hope this makes even a little since.
and that it helps -Chris