It depends on what kind of Material and where it is broke, and is it on wood fl. are conc. fl. If it is on wood fl. and you can get to it underneath then take up bowl and cut pipe down about 6″ are more and replace pipe by useing a nohub band and put on new flange. If it is coc. the n brake up fl and do the same. If edge is broke off the box stores have a half flange you can slide in its place. You tell me what kind of Material, and if it is coc. are wood fl. and if it is on 1st. fl. are 2nd fl. e-mail me at email@example.com and I will help you all I can, give me your e-mail add so I can send you some pic.