From one repo to another organization and several repos....

migration_and_split.md

bring hsitory from another repo

git remote -v
git remote add upstream https://github.com/{ORG}/{REPO}.git
git pull upstream master --allow-unrelated-histories
git add .
git commit -m "Bring all info from single repo"
git push

Branch by branch

git checkout -b {branch}
git pull upstream {branch}
git add .
#fix conflicts
git commit -m "Bring all info from single repo. branch {branch}"
git push