Team > Apply Patch...

This command (supplied by Eclipse, not part of Subclipse) applies a patch from a file in the local file system. The expected file format is compatible with that of Subversion (and therefore Subclipse), or rather, the format generated by the svn diff command is "unidiff" (by default) which is accepted by this command.

See also:

From the Eclipse CVS documentation: Working with patches

TODO: Review if this should be removed altogether, since it is more or less covered in "patches.html" in the "Tasks"-section.