[{"_id":1,"pageName":"List of Fruit","itemsList":[{"myID":101,"itemName":"Apple"},{"myID":102,"itemName":"Orange"}]},{"_id":2,"pageName":"List of Computers","itemsList":[{"myID":201,"itemName":"MacBook"},{"myID":202,"itemName":"Desktop"}]}]

db.collection.aggregate([{"$unwind":"$itemsList"},{"$project":{"_id":0,"itemName":"$itemsList.itemName","itemID":"$itemsList.myID","pageName":"$pageName"}},{$out:"myNewCollection"}])