In the clients list in the SEPM, select a group and choose install pacakages.
Right click and choose add to add a package.
In the drop down list you should see: Symantec End Point Protection version 11.0.5002.233 for WIN32BIT or
Symantec End Point Protection version 11.0.5002.233 for WIN64BIT
Assigning one of these packages to the group (not from the CD) directly from the SEPM console is the best and most efficeint way in maintaining you existing settings.
There is a checkbox for "maintain existing client settings".
Works great and in MR5 (RU5), it is pretty quick to deploy and update as well.
Hope that helps.