How can i rig door of bus from blender to UE4?

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I have rigged bus as this tutorial How to get wheeled vehicle from Blender to UE4[UPDATE] - YouTube
and it worked very good. But now i want rig the door of the bus.

Is there Tips or Tutorial please?
How can i get IK constraint from blendet in UE4?
How can i make parent between rig of Bus and Rig of doors?