Moe Belliveau says it’s certainly not the most important part of her job. But it just might be the most meaningful. She was talking about the ribbon cuttings that mark the openings of new businesses and expansions of existing ventures. As executive director of the Easthampton Chamber of Commerce, Belliveau, like her colleagues at chambers across the region, has taken part in more of these than she can count. In fact, after borrowing a pair of large ceremonial scissors for her first such celebration nearly three years ago, she ordered her own pair.