Hi,
To change the client from unmanaged to managed
Log on to the Symantec Endpoint Protection Manager Console.
In the Console, in the left pane, click Clients.
In the View Clients column, select the group to which you want to assign the unmanaged client.
Right-click the selected group, then click Export Communication Settings at the bottom of the drop-down menu.
In Export Communication Settings, in the group name dialog box, click Browse. The default selection is My Documents.
In the Select Export File dialog, locate the folder to which you want to export the sylink.xml file, and click OK.
In the Export Group Registration Setting for group name dialog box, select one of the following options:
To apply the policies from the group from which the computer is a member, click Computer Mode.
To apply the policies from the group from which the user is a member, click User Mode.
Click Export.
If the file name already exists, click OK to overwrite it, or Cancel to save the file with a new file name.
Copy the file to the desktop of the unmanaged computer.
Open the client interface on the unmanaged computer.
Click on Help and Support and select Troubleshooting.
Click Import, browse to the .xml file exported from the Manager, and click OK.