Hello Ihor.
I am not aware about aliases explicitly, but you can use tag hierarchy in your use case:http://orgmode.org/manual/Tag-hierarchy.html#Tag-hierarchy [...]
That was exactly what I was searching for, thank you very much. :)Have a great day...
-- eduardo mercovichDonde se cruzan tus talentos con las necesidades del mundo, ahí está tu vocación. (Anónimo)