shared mailbox rules to foward emails to aliases to specific folders?

Hi how can i use 1 shared mailbox ex: A(at)domain

then have aliases for that shared mailbox Aa(at)domain & Ab(at)domain

and set up rules that when a email is sent to Aa its moved into a folder Aa and/or when a email is sent to Ab its moved into a folder Ab,

ive tried using the rules but it puts them either in both folders if "stop processing rules" is disabled or if its enabled the highest priority rule....