Quote - I forgot to mention that these joint controlled morphs are partial body morphs, extending across more than one body part. Is the slaving code added to the targetGeom in each effected part or is there a place where this can all be accomplished at once?

You could do it either way. If you put the slaving code in a value parm in the BODY:

        valueParm SomeName
            {
            name SomeName
            initValue 0
            hidden 1
            forceLimits 0
            min -100000
            max 100000
            trackingScale 0.004
            keys
                {
                static  0
                k  0  0
                }
            interpStyleLocked 0
            valueOpDeltaAdd
                Figure 1
                A:1
                yrot
            deltaAddDelta -0.0333333
            valueOpDeltaAdd
                Figure 1
                BODY:1
                one
            deltaAddDelta -1.0
            }

You could then have one block of slaving code in each targetgeom channel, slaving it to "SomeName", with a 'deltaAddDelta' of "1.0". This could be an advantage if you want to experiment with the values in the slaving code, as you would only need to change the code in one channel. But if you don't think you will need to tweak the values, you might as well just put the two blocks in each targetgeom channel.