How to Update all things in document the document is populated with items and in that items their are nested objects?

Working with Data Node.js Frameworks
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this is my bill schema

  {
    customerName: { type: String },
    customerPhone: { type: Number },
    billMRPTotal: { type: Number },
    billAmountTotal: { type: Number },
    billDiscountTotal: { type: Number },
    billPercentageDiscountTotal: { type: Number },
    totalNumberOfUniqueItems: { type: Number },
    totalNumberOfItems: { type: Number },
    items: [
      {
        itemDetail: {
          type: Schema.Types.ObjectId,
          ref: "Item",
        },
        itemQuantityInBill: { type: Number },
        itemMRPtotal: { type: Number },
        itemDiscountTotal: { type: Number },
        itemSellingPriceTotal: { type: Number },
      },
    ],
    createdAt: { type: Date, default: Date.now },
  },
  {
    timestamps: true,
  }
);

and i want to update all the things in this schema…like if I added new items or if I changed the item quality bill.
I am getting the changed state of data perfectly fine but whenever I am using the findIdByUpadte method in Model it’s not updating that model.