Drilling with Vector

I've been playing with Vector 9.3 for the past two days (crash course) and
I've been able to draw pretty well with it. Now I'm trying to drill a
milling plate and have come up with a problem so basic I'm almost
embarrassed to ask the question, but here goes:

How do you make it drill?

I have the plate drawn, 4x8.5", with a pattern of points at 1/2" intervals,
120+ points in all. The workpiece is 4x8.5x0.5". I can build a G-code file
that positions the table for each hole, but have not figured out how to
bring the Z axis down. I want to drill 0.625" deep holes, by pecking.

I'm reasonably sure that the answer is a simple one, but it escapes me.

Anyone?

Dave Goodfellow
Northridge, CA
"No problem too small to baffle this expert"
(Boy, is that a true statement!<g>