When you create a buses module, by default Usine create also a bind object and this one is visible in the Binds panel, just below the devices.
Now, you can drag and drop this new bind object on any Knob or Fader of your patch to automate them.
You’ll also find information’s about using Binds if needed in the chapter “Uses the Binds” in the user's manual
We also find an option ‘show in bind list”in the settings panel of the send to data bus settings panel to enable/disable this option.
If you don’t see this panel, you can activated it in the settings panel of the devices panel