You will need to use loopback (merge or replace). Configuring loopback will mean that the user side will be processed at login on the specified computers. The scope of the GPO must reflect the computers and users to be effected, so if the policy applies to all users who log into the sales PCs leave authenticated users in the scope and add the sales PC security group.
Loopback can have odd effects on XP, but not Vista/7. If you have multiple loopback policies scooped within a single OU under XP its not clear which of them will be applied even if the scoping shouldnt effect the user. In my experience Vista/7 do not have this issue.


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