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Subrepo

Create a child repo:
Repo-A-ML-Utils
	git@github.com:rajasgs/repo-a-ml-utils.git

Create a parent repo:
Repo-B-Notebooks
	git@github.com:rajasgs/repo-b-notebooks.git

cd repo-b-notebooks
git subtree add --prefix mlutils git@github.com:rajasgs/repo-a-ml-utils.git master --squash

to pull all child repo updates in parent's repo:
git subtree pull --prefix mlutils git@github.com:rajasgs/repo-a-ml-utils.git master --squash

view subtrees:

code ~/.gitconfig

[alias]
    ls-subtrees = !git log --format=%b | awk '/git-subtree-dir/{ print $NF }' | sort --unique

Ref :

• git ls-subtrees