how to get 4 different subgroups on alto 2404


I just bought an alto live 2404 mixer and am quite happy with it. One thing is not clear to me:

are only 2 mixes on alto 2404 live mixer for the monitor chanels possible? I see it has 4 monitor (subgroup) channels, but how can you make 4 different subgroups. Or can you? I see only the possibility to have subgroup channel 1 and 2 combined as 3 and 4, with 4 volume levels. Can I somehow have 4 different mixes (like just piano on 1, the whole band on 2 and 3 and just the guitar and voice on 4)? How?
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