after getting help from Experts and running the WSUS server now I can not import PCs to WSUS server. well for now I'm just trying to import one PC as a test (beside mine which I imported using Server Site Targeting by using and changing local Group Policy) and I'm trying to using Client Site Targeting from Domain Group Policy,
I have created and changed the necessary settings Domain Group Policy (which I have the Image attached) and assigned it to my Test group OU. however I do not see that computer listing it self in my WSUS server.
please note that the WSUS server and the Domain Controller server are two different servers. the DC running server 2003 R2 and WSUS in on win server 2008 R2.
Also I have a default domain policy that prevents the clients PC + Server machines from automatically updating themselves,( I'm not sure if this is interfering or not, but I'm scared to remove this policy just yet, is because last time I did that all PCs started updating themselves and they screwed some of my organization software and applications.)