How to group color bulbs

[TonyFleisher]

Yes. You can create a virtual switch and mirror behavior with smart lighting.
Details can be found here:

Smart Lighting - Mirror Behavior!

I just discovered the Mirror Behavior option in the Smart Lightning SmartApp. I’ve been waiting for that feature forever. When was it added? Created a Virtual Dimmer and assigned the 6 dimmers in my kitchen to it using the Smart Lighting app and presto, can dim, on, off all lights with a single dimmer.