Hi friends; Thank you for your effort to help I really appreciated,As Kendra's said we couldn't solve this matter with poser,But I think PhilC is right,Actually,Last year I was tried to change that key word in the prop file,But I couldn't be successful exactly,I mean; I was work on a helmet prop with movable front visor!After the saving that helmet as a prop,I tried change "smartprop" keyword in the file but result was interesting: Poser accept that multi partial helmet as a smart prop but this time when I call the prop for the M4/V4's head xyz coordinates of the helmet was not correct?? I'm not good on Python script and maybe I made a mistake!I don't know? But if Dear PhilC can be tell me how should I do this exactly, I can solve this in a correct way this time :-) Thanks in advance for all kind of help :-) Cheers Kemal