You can use a pz2 to smartparent a prop to an actor in a figure. For example:

{
actor box_1
        {
        smartparent lShin
        }
}

Although this works for "smartparent" it does not seem to work for "parent". Note the use of "actor box_1" not "prop box_1". To remove parenting use: { actor box_1 { smartparent UNIVERSE } }