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To incorporate multiple endpoints into a Google Cloud Function, you can use a web framework like Express.js, which allows defining multiple routes and their respective handlers.

Here are the steps to follow:

1. Create an Express.js application in your Cloud Function code.

2. Define the routes and their respective handlers using the app object from Express.js.

3. Export the Express.js app as an HTTP Cloud Function.

4. Deploy the Cloud Function to your Google Cloud Platform account.

For example, here's how you can define two endpoints in an Express.js app to handle GET requests:

const express = require('express');
const app = express();

app.get('/hello', (req, res) => {
  res.send('Hello World!');
});

app.get('/goodbye', (req, res) => {
  res.send('Goodbye World!');
});

exports.app = app;

You can then deploy this code as an HTTP Cloud Function using the gcloud CLI:

gcloud functions deploy myFunction --entry-point app --runtime nodejs12 --trigger-http

Now, your function will be accessible at both /hello and /goodbye endpoints.