The Metropolitan Transportation Authority opened the Dey St. entrance to the Fulton Center last year and expects the entire $1.4 billion project, which will provide better connections between 10 subway lines, will open this June. Currently, the authority is installing and testing major systems including elevators, escalators and emergency generators. Architectural finishes on all floors are about 90 percent complete, and are scheduled to be done by the end of March. The center will also have an underground passageway to the World Trade Center train center.