Merge file or dir from one repo to another

from https://gbayer.com/development/moving-files-from-one-git-repository-to-another-preserving-history/
git clone <git repository A url>
cd <git repository A directory>
git remote rm origin
git filter-branch --subdirectory-filter <directory 1> -- --all
git filter-branch --index-filter '
                        git read-tree --empty
                        git reset $GIT_COMMIT -- cplcom/painter.py
                ' -- --all -- cplcom/painter.py
mkdir <directory 1>
mv * <directory 1>
git add .
git commit

git clone <git repository B url>
cd <git repository B directory>
git remote add repo-A-branch <git repository A directory>
git pull repo-A-branch master --allow-unrelated-histories
git remote rm repo-A-branch