Hi,
Thank you for posting in Symantec community.
I would be glad to answer your query.
You can do by placing all the server under one group and assign the policy. However make sure first whether it's really needed or not.
Because SEP makes the necessary exceptions for Exchange and AD servers.
If Microsoft Exchange servers are installed on a computer with Symantec Endpoint Protection client, the client software automatically detects the presence of Exchange. When the client software detects a Microsoft Exchange server, it creates the appropriate file and folder exclusions for File System Auto-Protect and all other scans. Microsoft Exchange servers can include clustered servers.
The client software checks for changes in the location of the appropriate Exchange files and folders at regular intervals. If Exchange is installed on a computer where the client software is already installed, the exclusions are created when the client checks for changes. The client excludes both files and folders; if a single file is moved from an excluded folder, the file remains excluded.
Reference: About the automatic exclusion of files and folders for Microsoft Exchange server and Symantec products
http://www.symantec.com/docs/TECH102400
How to Verify if an Endpoint Client has Automatically Excluded an Application or Directory
http://www.symantec.com/docs/TECH105814
About the automatic exclusion of files and folders
http://www.symantec.com/docs/HOWTO27182