Reverse Hierarchies (two way relationship)

Hello All,

My users have requested two hierarchies:

Product --> Store and Store --> Product

How do I proceed with such request? Do I define attribute relationship for such scenario or do I not? Are there any guidelines to consider for such scenarios? I am using SSAS 2012, my fact data is of descent size: 30M rows and I've a total of about 10 dimensions.

Thanks!

GBM