Sure, set the folders you want shared do "drwxrwxr-x" (in the terminal
sudo chmod g+rwx {folder}.
Thehn just make sure your users are in the same user group.
There are alternatives, but this is what the group function in this permission system is designed for.
You could also set the folders to drwxrwxrwx but that is not a good idea: any hacker who found your system could delete everything, which would be a bad thing
.