http://fle.github.io/git-tip-keep-your-branch-clean-with-fixup-and-autosquash.html shows how to use --fixup option to mark a new commit as being a fixup of an existing commit (like fixing a typo etc.).
While SourceTree offers a context menu during commits ("Commit options..."), this menu doesn't contain a way to make use of the --fixup option. It would be great if SourceTree would add this feature, like open a dialogue and scroll through the last commits and just mark one.
You can create a custom action in Sourcetree to create a fixup commit.
In Preferences, go to the Custom Actions tab and add a new action, call it Fixup and set the script to "git" and the parameters to "commit --fixup $SHA". Now you can stage changes and then right click a commit and choose Custom Actions -> Fixup to create a fixup commit based upon it.
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