Hi,
You mentioned that :-
If I set specific scan exclusions on a box, will the SEPM AV policy that is applied to that group override those exceptions?....
NO
As far as the exclusions are concerned it can be done from the SEPM as well as locally on the machine as well.
Therefore the machine will have two centralized exceptions policy one from the administrator and one from the local user. The only thing is that you wont be able to see the administartor defined exceptions but you will see the exceptions defined by the user locally.
So if I want just a specific exclusion for this one server, ( a specific drive or volume) do I need to create another policy or will the client side exclusions be ok?......
The client side exclusions will be OK