Bams means Bachelor of ayurveda and medical surgery... According to health ministry bams dr can perform surgery... Those who have trained can perform surgery after getting degree of master of surgery
Hope you got your answer
Yes you bams doctor can do surgery after ms but the doctor have to take approval for surgery by the Ayush ministry. Those who have trained in doing surgery can perform it. The Ayush ministry has cleared that surgery is the part of Ayurvedic studies.
Hope my answer will help you