Quote - ... can I parent a prop to a body part ( in a pose file too ) ?

It's tricky. The pose would need to be applied to the prop, because parenting is a property of the prop; but poses can't be applied to props unless they're parented. Catch 22. There is a way to apply a pose to an unparented prop, but it will only work in Poser 5 and above. Do you still want to do it? :)