How do I activiate a boolean in a control rig to activate from another blueprint?

[Whitney_Noble]

I have a VRCharacter. There is CR_VRCharacter_Procedural. When I grab with two hands, it should cause the hands to lock into place. Only issue. I don’t know any way of disabling the inverse kinematics because I don’t know how to get the Boolean to activate in any instance, let alone when I perform an action that’s coming from the VRCharacter blueprint.

In what way can I activate bHandLocked?