EDACS trunking does not work like Motorola's classic (Pre-P25) trunking formats.
A typical Motorola Smartnet system will have typically four channels that are allocated for control channel usage, and the system will rotate between those four channels so that at any given time, one of them is the control channel. Typically that channel rotates every day.
Bigger systems may have a larger pool of up to eight repeaters in the control channel pool.
You only have to enter the frequencies of those control channels into the trunked frequency list, in a system like that. You don't have to enter the voice only repeater frequencies.
EDACS has always used explicit channel assignments. There may be 20 channels at one site, and you have to enter them all and in the correct order. ANY of them may do duty as control channel on any given day.
With P25, as I understand it, it could go either way. I've never SEEN a P25 system that follows the EDACS channel list scheme, but apparently that's allowed. Typically you just enter the control channel pool and that's that.