Setting up cities in BuddyBoss forums

I need to set up my BuddyBoss forums so users can make posts automatically in the city they're in.

For example

North America -> Canada -> British Colombia -> Vancouver -> Fourm: Arts & Craft
North America -> USA -> New York -> Manhattan -> Forum: Arts & Craft
Europe -> United Kingdom -> London -> Forum: Arts & Craft

When the user logs in they should be directed to the discussion board of their current city