Slicer filtering

How to filter a slicer?

Scenario:-

My Tabular Solution is build in VSS2013 and i want to use only 2013.

I want to know how to create a manay- to-many relationships in VSS 2013 and filter both directions of the table.

And how to make the entire Pbix to use a single Smart metric , i.e., system can undersatnd my role and user name so only corresponding Geography heirechy is displayed as User previlages.

Thanks in advance!