Once PP knows the height of the ETS and you have referenced the spindle nose to the ETS then you can:
- touch off your tool to establish tool length from the tool offsets page
- use the ets to set z0 of your work piece from the work offsets page.
Granted, this all makes way more sense on a machine that utilizes tool holders and, therefore, has repeatable tool heights.
Check it the second and third video listed in the Basic section of this list