How to transfer bones from a model into another

My friend made a model of a demon for our game, but because of roblox’s triangle limit, he had to separate the parts and upload the arms, legs, torso, and head separately.

Because of this, the rig wasn’t there anymore in blender, and so he put the rig into a cube and imported it into roblox studio.

How can I put the bones and the rig from the cube into the demon model? This is the main question. Thank you.

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