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CAT Rigging bones constraint for root motion

Hello,

I have this issue, we want to give a constraint to a bone (NewRoot in the screens) so that it will follow the bone (root in the screens) only on movement (no scaling or rotation) when animated.
And we need to keep the hierarchy as it is in order to make it work on Unreal Engine 4 for root motion.

In the first screen is what I have now :

The second screen is what I’d like to have :

Here is the link to the file :
http://www.mediafire.com/download/xsjqwacb6iom8a1/Rig.max

Thank you in advance !

I suggest not using CAT as exporting skeleton but rather only to drive an underlying skeleton that you export. This way you can set up any type of constraints without fear of messing up CAT or important hierarchies.