The "SEE unasigned" group will only be populated by PCs that are not on the domain. Although we have PCs in there that are on the domain but for some reason are not identified as being on the domain, so its not perfect.
For instance, we have a domain that is not part of the same forest, these PCs are listed in there.
If your PCs are not listed in this section, then you cannot use Symantec Policies to change the configuration, you have to use Group Policy. Likewise you cannot use Group Policy to affect PCs listed in this section.