Good day.
If I have a work piece and set the x,y,z to zero.
Mach4 has the button to go to x,y to zero.

how can I do this to the z as well and later on put a button to use the command.

Thank you!

Both will take a little minor programming.
If you are talking about the button that says "Go To Work Zero" it has two choices for movement.
One includes the Z to zero but is commented out.
I can direct you on how to do it but you will have to do it.

Here is something I made when I was trying to learn how the programming is done.
It might help.
https://www.machsupport.com/forum/index.php?topic=45397.msg289143#msg289143

Bill