Add a template repository as a remote:
git remote add template [URL of the template repo]
Fetch all changes:
git fetch --all
Merge from the remote to the current branch:
git merge template/[branch to merge] --allow-unrelated-histories
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Add a template repository as a remote:
git remote add template [URL of the template repo]
Fetch all changes:
git fetch --all
Merge from the remote to the current branch:
git merge template/[branch to merge] --allow-unrelated-histories