Do you see screens similar to below?

In the images, I have enabled multiple ASIO Outputs, two sets of stereo.
Then these are used in the mixer for output. The rest of the bottom right sliders will be subgroups.
If not check your Audio Prefs for a check box called 'Assign unused outputs as subgroups' (or close).

If you do see something similar to this you should be able to right-click any track and assign it to the other Audio output using the Port option (last image). Assign it to Port 2 and it will go to the other output.
Then you can control it with the A2 slider and hear it on the other Focusrite channels.

I couldn't use my Focusrite as an example because it is the 2i2, so I don't have multiple outs to select.

Attached Files (Click to download or enlarge) (Only available when you are logged in)
ASIOOuts.jpg (56.04 KB, 41 downloads)
2Outs.jpg (68.72 KB, 41 downloads)
AudioPorts.jpg (69.44 KB, 36 downloads)

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