There should be one in that group.
we've always used this to cover NOM: https://community.microfocus.com/it_ops_mgt/network-mngnt-openview-nnm/f/itrc-165 but you make a good point that, at a minimum, it should point to this forum from the main NOM page. I will work with our product teams to fix this.
Yes perhaps that will do for the moment. May be we will need to play with tags/labels to further categorize sub-groups in NOM later on. Otherwise person having issue in NOM that is not NNMi related (COSO, K8S etc) will have a hard time reaching the right audience/expert.