Can anyone tell me how to force a Z value manually as opposed to

Can anyone tell me how to force a Z value manually as opposed to entering a z value to go to. Im trying to set my Z0 1 mm below the surface of the work material for a facing operation.

If there isnt a UI method a CLI method also welcomed

Mimic how the axes widget does it by looking at what it sends in the console

thx John Ill check it out.

now to fake a touch plate:-)

That did the trick G28.3 Z.025 set the surface zero to 1/4 mm so going to Machine home enable me to take 1/4 mm skim of my spoil board. Fun stuff