As the bath stall is all one object (walls and WCs), you will need to look at the 'Add Parameters' button in the schedule settings to see if you can find the parameters in that object that are useful to you.
You would actually be better of placing individual WCs as they will be much easier to schedule.
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10