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There are several steps to retrieve and store data from a webpage as a nested form in MongoDB using Node.js:

1. First, you need to fetch the data from the webpage using a web scraper or an API. This can be done using a variety of tools like Puppeteer or Cheerio.

2. Once you have fetched the data, you need to create a schema for the MongoDB collection that will store the data. The schema should include the fields that you want to store, including any nested data.

3. You can use the Mongoose npm package to define the schema and create a model that represents the MongoDB collection.

4. After defining the schema, you can use the model to create a new record in the MongoDB collection for each piece of data that you fetched from the webpage.

5. If the data you fetched includes nested data, you can use Mongoose's subdocument feature to add the nested data to the main document in the collection.

6. Once you have added all the data to the collection, you can use Mongoose's find() method to retrieve the data and return it in the form of a nested object.

Here is an example code snippet that demonstrates how to store and retrieve nested data using Mongoose and MongoDB:

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

// Define the schema for the main document
const mainSchema = new Schema({
  name: String,
  address: String,
  nestedData: [
    { name: String, value: String },
  ],
});

// Define a model for the main document
const MainModel = mongoose.model('MainModel', mainSchema);

// Connect to the MongoDB database
mongoose.connect('mongodb://localhost/myDatabase', { useNewUrlParser: true });

// Define an object that includes nested data
const data = {
  name: 'John',
  address: '123 Main St',
  nestedData: [
    { name: 'property1', value: 'value1' },
    { name: 'property2', value: 'value2' },
  ],
};

// Create a new record in the MongoDB collection for the data
const newData = new MainModel(data);
newData.save().then(() => {
  // Retrieve the record from the database and print it to the console
  MainModel.findOne({ name: 'John' }).then((result) => {
    console.log(result);
    mongoose.connection.close();
  });
});

In this example, we define a schema for a main document that includes a name, address, and an array of nested data objects. We then use Mongoose to create a model for the collection, connect to the MongoDB database, and create a new record in the collection based on the data we fetched from the webpage. Finally, we use Mongoose to retrieve the record from the database and print it to the console, demonstrating how the data is stored in a nested form.