Sorry for the misunderstanding, I'm having trouble figuring out what you're trying to accomplish.
In axon you can select the group or extension you want each external line to ring for an incoming call. I assume by 'I do not want the main call to RING on a group of numbers' that you will set it to ring a particular extension.
This is the part that confuses me, 'Can that extension dial a group after being routed to the extension?' and 'just the extension ring a group after being routed to that ext.'
Isn't this the same as simply routing to a group in the first place?
If I can better understand what you are trying to do, I'm sure I can come up with a solution for you, but at the moment I am at a loss to the purpose of all this.
Is it that you want to be able to call in an extension directly, and then let callers dial an extension which actually dials a group of extensions? Are you trying to differentiate between calls made directly to an extension vs calls sent there (e.g. by an IVM transfer)??
Please provide further details.