First, thank about answer my question. And I'm beginner of poser. And I need your help. I made obj file. And I import it in poser. And I made born in 'Setup Room'. And I made group by 'Auto Group'. It worked very well. And this time, I imported obj file(the same thing) in poser. And I made born in 'Setup Room'. This time I made three born. And I made group by 'Auto Group'. But it work not well. Of course, I commanded 'weld Group' But, It does not work well. One rail form born work very well. But, multi born (3 ~) does not work well. I break aparted. You can download my file. - http://www.visionmode.co.kr/001/born/down.zip And You can see image. - http://www.visionmode.co.kr/001/born/003.html Please help, me.