I would like to cut two corners off a piese of aluminimum. I am not sure what toolpath would be the best? Any suggestions?

I have mastercam ver. 8.1 and I would like to know how to do a step down. I am trying to make a 1 inch hole with a milling machine and I would like to increase the depth slowly aka stepping down. Does anyone know how to do this in mastercam ver 8.1. I created the toolpath by using a pocket, chain. Thanks Mark