If you don't know how to open multiple account at a time then don't worry we have Gmail customer service team who is sharing this post which is helpful to open multiple account just following these simple steps.
Add your Gmail/ Google Account
1. open www.google.com/ www.gmail.com.
2. Enter your Gmail account email address and password.
3. click on login button.
4. Now you are log In in your First Gmail email account.
5. You need to click on your profile photo or email address at the top-right corner of the page.
6. Now click on Add account from the drop-down menu.
7. You need to enter the username and password for another account you want to access, and click Sign in.
How to Switch Between these Account?
1. you need to click on your profile photo or email address at the top right of the page.
2. select the account you'd like to sign in to.
if you have any issues regarding this post then you can also call on Gmail customer service and technical support phone number which is toll free for USA Gmail users.