Unfortunately the Cue and Aux routing is a weak point of Console 2.
There are only 4 Cues, however, they are stereo. I think the Apollo 8 defaults to 2 Cues. To set 4 Cues select the Menu screen and set your Cue Bus count to 4.
As the cues are stereo, and this will give you eight channels. In the Cue Output screen set the Cue outputs 1 to 4 to ADAT 1 to 8.
You can then pan the Console 2 channels hard left and hard right to get them to play in the individual cue outputs as you require, but that leaves you a problem with the stereo mix. You can do a mix and route it to a Cue, but it will reflect everything panned left and right...
Or you can use a Cue to mirror the Stereo mix, but then you cannot set the 6 individual Cues as you would like.
An alternative is to do the mixing of the stereo mix and 6 sub channels you require in 8 channels in the DAW and return the mixes on virtual channels and send these virtual channels to the Cue outputs, or use the DAW for the 6 individual cues and Console for the stereo mix.