Install
This is the repository archive. It installs, but the folder name will carry the branch suffix and updates will not flow.
Install straight from GitHub with WP-CLI:
wp plugin install https://github.com/phoopee3/jhl-copy-term/archive/refs/heads/main.zipNo built-in updater. New versions won't appear under Dashboard → Updates. Install new releases yourself, or let Git Updater track the repository.
jhl-copy-term
WordPress plugin to duplicate a term and its children
The plugin adds lets you pick a taxonomy, then a term to copy. It will then show an input field for the new term name. If the term has children you will be able to select which children you want to duplicate to the newly created term.