Setting up conda channels

I have a self-hosted Nexus server running on AWS
Version Sonatype Nexus RepositoryOSS 3.54.1-01

I currently have Conda set up (as a proxy) and I would like to add 2 additional channels to this conda proxy - bioconda and conda-forge

I am having trouble with the configuration for this - do they each need to be a new proxy? Or are they part of the existing conda proxy?

I looked into this - Repodata patching — Bioconda documentation but did not help. I tried creating a new proxy called bioconda with url bioconda but it did not work.

If someone has succeeded to set this up I would appreciate assistance with this.