The former head of the Maine International Trade Center has started a consulting firm to grow Maine exports. Janine Bisaillon-Cary has started Montserrat Group LLC, based in Cape Elizabeth, according to a news release Thursday. The consulting firm aims to help Maine businesses develop export markets and sales. “One of the biggest challenges our companies face is time management – having the time to devise a strong export plan, execute a localized marketing strategy, and turn trade leads into export sales,” Bisaillon-Cary said in a written statement.