Unfortunately there’s no direct fast way to achieve what you mentioned, but Cubase has one command called “Paste in Place”. create a key command of your liking for this.
Once done, you can do your automation on ONE channel first.
Once you’re happy with your automation, mass select all the edit points in your automation, and use the “Copy” command.
Go to another channel (that you wish to have this duplicated) and select its automation track. Hit “Paste In Place”, and all your copied automation data will be pasted exactly in the same positions just like in your first channel.
Repeat the same for whatever other channels you wish to duplicate your automation.
If you want to be able to move automated channels simultaneously without having to de-activate “Read” on any of them, simply have all the automations revealed and shown in your project, mass select the WHOLE LOT of them, and hold down “Ctrl”.
When you move the automation of one track, the rest will also follow suit.
Pretty damn tiresome but once you get used to it…you’ll do it quick.