If you want to update the working copy only with the selected commits, you must combine them - you actually create a local branch with the selected cherry commits from the trunk, although the last update should pick them up OK. You will want
svn log -l 1 http:
to find the version number you need, then
svn merge -c 12345 http://remote-repository-url/
to combine future 12345 commit into your WC.
Or, if changes are made to disjoint directories, you can simply
svn update dir-with-changes
to split the revision of your WC and select only the changes in the named directory.
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