If I understand correctly what you are looking for, viz trying to select an autoexec conditionnaly based upon some user's attribute in metadata, I think it won't work that way. Auhentication domains are no placeholders for tagging users, they're technical artifacts for streamlining authentication processes (for instance : users authenticating with their AD account/pwd, generic DBMS accounts like Oracle authenticating against some LDAP directory etc.). Description field can be reused, but as @Damo has shown, it requires (costly) custom requests in metadata because this information is not presented by default when a SAS session is launched.
If you try to follow the standard SAS 9 guidelines, you might have to create new objects instead,namely
1) a second Workspace Server references in Metadata (Plug-in Server Manager)
2) the corresponding Configuration directory, which comes with some customisable Autoexecs
3) a second metadata Group
3 4) some ACTs to redirect users groups to the first Wk Server or to the 2nd based on their MD group
If you want to spare some extra directories, 2) is not even required sometimes.
With this, the user launches the autoexec conditionnaly without having to devise some custom MD request & custom parameter storage within a user's MD references : this is automatically handled by metadata standard security rules.
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