6 is the yearly star that goes to the Centre Palace which replaces Star 1.
7 will go to the Northwest sector which is the 2nd palace that represents the 2nd floor or the 2nd compartment (room). So if you're staying in the 2nd compartment (room) or the 2nd floor (taking ground floor as 1st floor), then number 7 is metal. The 2nd floor belongs to 2 which is fire, meaning 7 metal is controlled by fire; which means compartment controls year.
Year number 8 goes to West which is the 3rd compartment/ floor, 8 is earth and the 3rd compartment/ floor is wood. Wood controls earth.
Use the compartment room and floor according to the He Tu elements and the yearly star according to the Lo Shu elements.
