With Mongoose, how to separate the model functions in multiple files - mongodb

Question

I have a unique file that contains all the functions I apply to my mongoose model.
But as I plan to have a lot of functions I would like to have several sub-files that contain these functions.
For example I would like to have a "user functions" sub-file and a "product functions" sub-file.
I can't manage to do the import/export to get this result.
For now I have this file of functions:
const Schemas = require('./Schemas');
mongoose.connect('mongodb://localhost/test', () => {
console.log('Connected to MongoDB');
}, (err) => {
console.log(err);
});
async function createUser(name, email) {
try {
const user = new Schemas({
name,
email
});
await user.save();
console.log('User created');
} catch (e) {
console.log("### ERROR: ",e.message);
}
}
async function createProduct(name, price, userName) {
try {
const product = new Schemas({
name,
price
});
await product.save();
const user = await Schemas.findOne({name: userName});
user.products.push(product);
await user.save();
console.log('Product created');
} catch (e) {
console.log("### ERROR: ",e.message);
}
}
createUser('John', 'john#doe.com');
createProduct('Product_name', 100, 'John');
I would like the createProduct function to be in another file!
I don't know if it is important. This is my Schemas.js file:
const { Schema } = mongoose;
const productSchema = new Schema({
name: String,
price: Number
});
const userSchema = new Schema({
name: String,
email: String,
products: [productSchema]
});
module.exports = mongoose.model('Schemas', userSchema);