Howdy,
In your case, ARS time of day routing won't work for you.
You'll have to have someone either put the system in Day,N1 or N2 and then route via call rerouting or via the Trunk Service assignment form.
My pref is the Trunk Service assignment form.
(1) set up a system speed dial to go to the remote location. Be sure to say "yes" to over ride toll control.
(2) in the trunk service form, program the trunks to go to:
Day mode: Your local extension
Night 1: The system speed dial for the remote site
Night 2: The system speed dial for the remote site
Now, when you want to answer the calls locally, put the sytem into day mode.
Note, it is possible to program the system to automatically go into day/n1/n2 but is beyond trying to explain it here.
Ralph