DALIAN, China -- Dalian Wanda Group, China's largest mall operator, will sell its remaining shares in an investment arm to a domestic film production company, as the conglomerate scrambles to avoid a default amid a deepening real estate slump. Wanda Group units and the group's founder will sell 51% of Beijing Wanda Investment to China Ruyi Holdings, a Tencent Holdings-backed company that has produced hit films and television shows.