You just set it up as your routine. I have the Ecobee 4 and I have a sleep schedule in it but when I leave, come back, or go to bed, Smartthings overrides the temperature on the thermostat. Your thermostat will show something like “*77 and holding”, and the 77 would be whatever temp you programmed for that routine.
Something I did notice is that if you have the vacation set for a period of time, Smartthings will not override your temperature setting while you are in vacation mode. If you come home early, you have to turn it off, which is just deleting your vacation entry.