Hi Joseph,
Sadly, there is no delayed ring setting on any CCM version. What you do here normally is to setup a secondary number on the Admins phone and then have the Mnager DN Call Forward No Answer to it after x-number of seconds of ringing on the Manager phone.
For example;
Manager Line = 5555 (CFNA to 1361 @ 6 seconds)
Admin Phone Secondary Line 1361 (CFNA to Unity Pilot @ 6 seconds)
Admin Phone can also include a non-ringing appearance of 5555 just for a nice visual monitor.
The Voicemail should automatically roll to the Manager mailbox in this scenario :)
Hope this helps!
Rob