Repeating Home automation processes

I have a number of devices in my HomeKit setup that run the same process (multiple switches that toggle the same lights, for example).

I’d like a way to write this process once and reuse it (so I don’t have to alter it in many places if/when I change my setup).

I originally thought about writing an iOS shortcut and then calling it, but that doesn’t appear to be available.

Any other options?

Thanks.