This question deals with dynamically created pages, it seems, and Google seems to recommend NOT choosing the "no" option in WMT - choose "yes" when you edit the parameter settings for this and you'll see an option for your case, I think, Christian (I know this is 3 years late, but still).
BUT I have a situation where we use SiteCatalyst to create numerous tracking codes as parameters to a URL. Since there is not a new page being created, we are following Google's advice to select "no" - apparently will:
"group the duplicate URLs into one cluster and select what we think is the "best" URL to represent the cluster in search results. We then consolidate properties of the URLs in the cluster, such as link popularity, to the representative URL."
What worries me is that a) the "root" URL will not be returned, somehow (perhaps due to freakish amount of inbound linking to one of our parametered URLs), and b) the root URL will not be getting the juice. The reason we got suspicious about this problem in the first place was that Google was returning one of our parametered URLs (PA=45) instead of the "root" URL (PA=58).
This may be an anomaly that will be sorted out now that we changed the parameter setting from "Let Google Decide" to "No, page does not change" i.e. return the "Representative" link, but would love your thoughts - esp on the juice passage.
Tim