Ventrilo - User Editor - Chan Admin tab
Channel Admin rights are given to specific accounts and for specific channels only.
Current
This window displays the current set of channels that the account has Channel Admin over. Once an account has Channel Admin they immediately gain admin status over all of its sub-channels, so there is no need to add the individual sub-channels.
Available
This window displays those channels that the person modifying the account currently has admin control of, or it will be all channel names if this person has Server Admin rights.
As a Channel Admin only that also has "Add Users" rights you can only assign Channel Admin rights to those accounts for which you have ownership and only for those channels that you have admin rights to.