Well ya gotta make 'em and name 'em. So following your naming scheme there you have to go r_shoulder, r_upperarm, etc.. once you have then all named and coming off the right parents all you have to do is click figure>symmitry>mirror left to right and it will move all the new bones in to the opposite positions as the left ones. On a completly side note, with you naming like that traditional poser poses will not work on this figure as the bone names are not conventional. the poser conventional naming is lCollar, lShldr, lForearm, lhand...

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