Symbolic link (symlink) creation in Linux is possible thanks to ln -s command. Below you can find a command to make a symlink called /home/bartosz/my_trash for /home/bartosz/tmp directory:
ln -s /home/bartosz/tmp /home/bartosz/my_trash
To remove created symbolic link, simple rm command suffices:
rm /home/bartosz/my_trash
It removes only alias but original directory (/home/bartosz/tmp in this case), won't be touched.