Updating this with some more accurate terminology (apologies, I'm new to CNC)

By temp zero, I meant Working Zero.

To save:
1 - Home the machine (C3)
2 - Move to Work Zero
3 - Save X,Y and Z
4 - Set as Work Zero

When I restore:
1 - Home the machine (C3)
2 - Set as Work Zero (ZT)
3 - Load saved X, Y and Z
4 - Change Work zero to restored values (using VA)

I know that I could just write down the settings, but I would almost certainly forget sometimes and this is what software is good at