uhm, I've never actually done this
how do I do this..? >.>
I only have Poser5, but this is how to turn on the IK Chains—or turn them off, for that matter
1. In Poser, open the Hierarchy Window, which lists all of the figures and props in your scene. Click Window > Hierarchy Editor
2. Within the list of figures and so forth, find the figure whose IK Chains you want to turn on/off.
3. Under the hierarchy for this figure, you will see a list of IK Chains associated with this figure; I believe the list appears after all of the figures body parts have been listed. The list of IK Chains might be collapsed (i.e., not visible); if so, expand the list.
4. Next to each IK Chain is a box. To turn on an individual IK Chain, click the box next to the chain's name. Or, uncheck it to turn it off.
I'm attaching a screen shot of the Hierarchy Window, showing IK Chains turned on for both legs of Kinboat's paperdoll. Having these IK chains turned keeps the feet in place as other body parts (e.g., the hips) move. The Right Foot and Left Foot body parts are then moved by changing the x- y- and zTrans properties—just as you would the hips or a prop. The IK Chains for the arms are off.