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1. Pull changes from the ACME subtree into a new branch (git subtree split -P <external_subdir> -b <external_branchname>).
2. If necessary, add remote for updated external (If git remote does not list your remote, add it with git remote add -f --tags <external_name> <external_url>).
3. Create and switch to new external branch Switch to your remote and create a new branch for merging ( git checkout -b mct_master --track remotes/<external_name>/<external_mergebranch>)<external_name>/master; git checkout -b <external_mergebranch>).
4. Merge the changes from your subtree into your new branch (git merge <external_branchname>).
5. Push the branch to the remote repository (git push -u <external_name> <external_mergebranch>).
6. Follow other procedures for updating the external (depending on that external's workflow).

Note that Steps 3+ may be different depending on the rules for updating the external. To simply share the split code, push <external_branchname> to the appropriate remote repository.

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