# A relative path to the directory
pdm add -e ./sub-package --dev
# A file URL to a local directory
pdm add -e file:///path/to/sub-package --dev
# A VCS URL
pdm add -e git+https://github.com/pallets/click.git@main#egg=click --dev
Remarks: Editable installs are only allowed in the dev dependency group.
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