It is possible to program in Mastercam through holes in square tube 4X4 x0.375   . I would like to keep drill in the same hole drilling first wall then rapid down to bottom wall and drilling bottom wall,  and then go to next hole.   I don't like drilling top surface and then come back and lower "top stock" and drill bottom wall. I would rather stay in the hole. I can manually modify post ,but I have 30 holes and editing each one is very painful. Thank you.