In *Save Patch*: select *In file System* and enter the *path/to* and *patch file name*. In my example my *path/to* is C:\tmp\ and my *patch file name* is csf-common-legacy.patch.
In *Include changes*: uncheck anything that begins with a *dot* (i.e. .settings, .project, .classpath, etc).
Your dialog should look similar to the following:
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