JEHOVAH's WITNESSES: "Jehovah + 'a god' Created All Things"

Jehovah's Witnesses teach that Jehovah God directly created only one thing, and that "a god" directly created all other things.
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Question to Jehovah's Witnesses:
In the beginning, What did Jesus actually DO in that all things are said to have been created through Him?
I kindly welcome any JW (or Ex-JW) to consider an answer and discussion. God bless!