SCUP 2011 - possible to publish an update to only one WSUS computer group?

Hello,

I´d like to use SCUP 2011 to deploy Adobe Flash Player Updates to our clients. We are using WSUS 3.0 to Publish windows Updates (not SCCM).

In WSUS we have several computer groups in which the computers get sorted in by GPO.

When i now try to publish an Update, there´s no opportunity to say "publish the Update to group "computers"" (for example)

Is there a way to do so or is an SCUP Update always published to every computer which gets it´s updates from this wsus Server?

I also have another Question - how do i "unpublish" an update? Is there only the way to mark the Update as expired?

Thanks!!