ZSH function to change to child directory using FZF.
cdfzf <root-dir> <levels>
For example, I aliased cdprojects to cdfzf $PROJECTS_DIR 2. This alias makes it easy to jump straight to the root, child, or grandchild directories of my projects folder with fuzzy searching with FZF. (The fzf completion list will include empty string to allow selecting no child directory.)
First, if you do not use fzf, this plugin will not be useful.
Next, source tm.zsh in your zsh file.
Personally I use Antibody to load zsh plugins. Add kjhaber/cdfzf.zsh to your plugin list, then reload zsh.