Can't create a second VCA fader

I can create one VCA fader using ‘Add VCA to selected channels’, but if one of those channels is again selected and I attempt to create a second VCA fader, Cubase just ignores my request.

Because that can’t be done !
Watch the intro video again or consult the Manual.
Channels can only be routed to a single VCA, but VCAs can be nested in other VCAs.