Considering ST to replace Insteon. What ST options are there for dimmers that don’t have a neutral?

Yeah, we often say that smartthings is very powerful but not very discoverable. :wink:

The short answer is yes.

“Automations” are rules, which have a trigger and a target. So if the switch A turns on, then turn on Switch B.

In a smartthings context, a “scene” is a snapshot of one or more devices at a particular moment in time. So switch A at 50%, switch B at 75%, switch C turned off. Then you can initiate that scene either through an automation or just by tapping it in the app.

https://support.smartthings.com/hc/en-us/categories/115000465506-SmartThings-App

The longer answer is in the following FAQ:

How to Get Started Creating Complex Rules in SmartThings (2017) (SmartThings Classic)