If you want to have a list of all the clients reporting to Symantec Endpoint Protection Manager console, highlight My Company group.
If you want to check for a specific group, select the appropriate group.
In the Search Clients pop up, ensure that "Computers" is selected in "Find" drop down listbox.
Do not select any option under "Search Criteria".
Click on Search.
If you have selected the "My Company" group, this will list all the computers reporting to Symantec Endpoint Protection Manager console.
If you have selected a specific group, it will display only the clients belonging to that group.
Click on the Export button which will be active after the search results are displayed.
Confirm the From & To Page numbers.
Click on Browse and select the File Path.
Specify the file name & click OK.
Click on Export.
This will export the file in .txt or .csv format in the location specified
http://www.symantec.com/business/support/index?page=content&id=TECH123451
Or
There is an easy way...
you can open the required group to export its clients and select all clients "Ctrl+A" and then copy "Ctrl+C" then past it in Notepad or Excel.
Note 1:
there is no Copy option in the Context menu when you right-click the clients.
Note 2:
You can export a list of all clients in all Groups in the server by searching the Global Group for all clients and do the same thing to Select All then Copy.
Or
or use Monitors, Logs, Computer Status and click Export to get a CSV of all the information about the computers in the console
Check this thread
https://www-secure.symantec.com/connect/forums/how-print-out-all-sep-client