How to remove a field from a thriply nest documents

Hello everyone, I am new to MongoDB. Currently I am stump as to how I should be removing {“trip number”: “15”}.

I tried writing as db.transport.update({“EMPLOYEE.e#”: “11”},{$pull:{“EMPLOYEE.trips.trip number”: “15”}}).

But the return input was errmsg: Cannot use the part of Employee…

Hope you are able to assist me on this. Thank you

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