goto is a path bookmark utility that would help you navigate within the filesystem using bookmarks. It comes with auto-completion and bookmark addition command goto_add.
Once you cd yourself into a path, you can run goto_add bookmarkName to add the current working directory into the bookmark. Once added, you can use goto bookmarkName to cd into the location, from elsewhere.
The bookmark-name as well as any sub-directories under the location can be auto-completed by the usual bash means. The bookmark-name and its subpath(s) has to be separated by #. You can also go a level above (and auto-completed) using goto bookmarkName#../.
See go_bookmarks.conf for some examples. The config is re-read and executed each time you invoke goto or the auto-completion, so that the changes are instantaneous.
In order to install this into your profile, edit your .bashrc and add the below lines.
go_projects_conf=$HOME/go_bookmarks.conf
source $HOME/go.sh