Units and Groups To add a new unit, simply click on Add New Unit, and click on the correct house code and unit number. You must provide a short description of the unit. If the device supports dimming (light modules, most wall switches), you should check the Dimmable option. You can delete units. They will be removed from existing groups and scripts automatically. The On, Off, and Dim Off buttons take effect for a chosen unit or group as soon as they are clicked. (The effect will be delayed if X10sched is currently downloading scripts or other commands.) The Dimness bar, if enabled, allows you to send dimming commands with a single click. To create a Group of units, click on Add New Group, and then click once on EACH unit you want to be a member of the group. A unit can be a member of any number of different groups. You may also add groups to groups. A group can hold up to 64 different units or groups.