By the time of replication it will create a management server list (you can identify this list by the site name.If you are still confused edit the same and it will tell you the IP address and name which it belongs.).This you can find in Policies---->Policy components--->management server list .assign it to the group which you required(The groups which the clients which is suppose to receive virus definitions from replication server.)
or 
create a new management server list and assign to the groups which the clients which is suppose to receive virus definitions from replication server.Refer this doc
Creating and assigning a management server list for a Symantec Endpoint Protection Manager