Download only not installed patches?

As fas as I found out WSUS downloads at first ALL patches (for e.g. Win 7 since SP1) and then (in the second step) installes only those which are NOT installed yet.
Simplified in other words:
WSUS downloads e.g. all pos-SP1-patches 1,2,3,......, 177,178,179,180
and installs only 178,179,180 if all other patches 1,2,3,....,177 are currently already installed.
Is there a way to tell WSUS only to download those patches which are NOT installed yet?
In other words only to download patches 178,179,180 in the sample above?
Peter
Simplified in other words:
WSUS downloads e.g. all pos-SP1-patches 1,2,3,......, 177,178,179,180
and installs only 178,179,180 if all other patches 1,2,3,....,177 are currently already installed.
Is there a way to tell WSUS only to download those patches which are NOT installed yet?
In other words only to download patches 178,179,180 in the sample above?
Peter