Alto 1604 subgroup routing query. How do I get a channel strip on subgroup 1 alone and not on both 1 and 2?

I want to send a channel strip to one of the subgroups from 1-4. Currently it seems you can send it to either 1 and 2 and or 3 and 4. Is it possible to send the channel to 1 or 2 or 3 or 4 alone?
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