There are three requirements for an IK goal body part (in the actor section):

parent
inkyParent
nonInkyParent

parent and nonInkyParent are typically the same body part used when IK is disabled.
inkyParent is the parent body part for the goal body part when IK is enabled.

To have this reparenting happen automagically, you also need to turn on IK in the appropriate inkyChain section of the figure section in the CR2.

If you are attempting to parent the body part to a prop, then I guess it gets trickier.  The prop will need to be part of the CR2 for this to work - otherwise the inkyParent goes 'huh?'. :)

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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